Check Plenums ! **NEW MEMBERS TAKE NOTE** - Page 13

rich17865 · 13th December 2015, 21:14

Quote:

Originally Posted by MDMH757

With all the rain we just had this weekend just been out and done my plenums by Mobile phone flashlight.... here are the before & after rodding photos!!!!

I'm glad I did!!!!

Eurgh, hope you are fitting a new pollen filter

MDMH757 · 13th December 2015, 21:28

Oh yes...next weekend , got one in garage .... I reckon that probably the original looking at state of it....

cy80rg · 15th December 2015, 06:55

Morning all,

After noticing water in the drivers side foot well, did my ns plenum last night - sure enough blocked and full of water.

Unblocked, and the water drained out.

Sponged as much as poss out last night...

Have had the heating on "Hi" , using the floor vents to dry it out more.

Driving in this morning, the foot well's got about an inch of "dirty" water, and the rear foot wells full again!

IN particular, the "bowl" under the drivers seat that the vent is in seems to fill up first - if I didnt know better I'd say the water was actually coming out of the vent? Is this even possible?

More likely (hopefully) I just havent mopped it all out yet?

FWIW, when I went to refit the carpet trim in the drivers door, the clips were "glued" in with black mastic - I removed this to refit the clips.

This is in the upper edge of the body (rather than the underside of the door), so I dont believe water can get in there?

Also, I've just had the "reinforced handbreak compensator" mod fitted - anything in there that could have been left off / undone etc, allowing water in?

The passenger side of the car is dry as should be.

I did the new gaskets in the rear lights last year, and the boots fine.

Just looking for some reassurance, or something else to check?

Ta, and Happy Christmas!

Quick thought...

I havent cleared my OS plenum yet - a mate said that as the "drainage area" went across to the other side ("full width") it would drain through the NS plenum I'd cleared...

Reading this thread, I see later models *didnt* go accross like this, so wont drain the OS through the NS drain?

Have seen lots of info on clearing the NS drain, but not for clearing the OS (those threads mostly say you only need to bother with the NS).

Can anyone point me at such a "how to"?

Think I'm gonna have to bite the bullet, get down in the rain and clear both plenums again... oh joy...

Also, when fitting the "aquarium foam" mod - which area am I looking to fill, the whole area of the "plenum tank" behind the pollen filter?

Jules · 15th December 2015, 09:14

Have you got a sunroof?

http://www.the75andztclub.co.uk/foru...d.php?t=118622

There will be gallons of water under the carpet as the foam sound proofing is 2 inches thick in places !

cy80rg · 15th December 2015, 09:27

Hi Jules - no, no sunroof (thankfully!).

Cars parked on a gradient, down towards the bonnet.

Sponged another 2 inches out this morning, but hopefully just the "remainder" gathering...

Will keep an eye on this in the coming days, and do the spy hole mod soon.

Anything else it could be?

Quote:

Originally Posted by Jules

There will be gallons of water under the carpet as the foam sound proofing is 2 inches thick in places !

Hmm, I think it's gonna take some sponging to get it all out then...

"We're gonna need a bigger sponge"

Think I'm pretty confident the underlying issue (blocked ns plenum) is sorted, and that it's just a case of getting the remaining water dried out.

Out of interest, when I took the weather "trim" (?) off to get at the ns plenum, the "foam block" in the corner between the two weather strips is loose - i.e not glued down anymore - litterally just sitting there held down by the bonnet.

Thinking of using aquarium / silicon glue to reattach - any other suggestions?

Arctic · 15th December 2015, 10:17

Hi Charles.
If the plenum as flooded then that is where the water as got in, on some of the earlier models the centre partition will be there, if this is the case water can and will collect on the OS part of the plenum.

You need to get under the car and check both plenum tubes and cut about 20mm off each one, I cut mine at a45 degree angle this is not required it is just the way I like to do it link below.

Cut off the first little section in photo one in the link which is clogged up.
http://www.the75andztclub.co.uk/foru...ad.php?t=84865

http://www.the75andztclub.co.uk/foru...ad.php?t=86684

Also have a good read through this link if you have not done so already.
http://www.the75andztclub.co.uk/foru...89&postcount=1

If I was you I would not glue anything in place and do not put anything into the main plenum chamber, purchase a jules plenum guard for the OS wing area.

You could also do this below as a belt and braces
http://www.the75andztclub.co.uk/foru...6&postcount=19

The scuttle screen panel can also leak.
http://www.the75andztclub.co.uk/foru...3&postcount=61

The spy hole mod
http://www.the75andztclub.co.uk/foru...1&postcount=21

Sorry lots of link but quite a few members will get caught out with this really wet weather we are having, and there is more to come, good luck Arctic

cy80rg · 15th December 2015, 10:51

Thanks Arctic - been doing lots of reading on this, will def order the guard for the OS and the out-feed pipes as you suggest.

On "another" site, I see that there's 3 plenum drains

- under the plenum cover, ns
- to the right of the plenum cover, ns; looks easy to access?
- Under the brake servo, off side

Do all models of the 75 (mine's 2003 ROVER 75 CLUB SE (MANUAL / PETROL)) have the 2nd drain as above, didnt notice that on mine last night?

Arctic · 15th December 2015, 11:33

Quote:

Originally Posted by cy80rg

Thanks Arctic - been doing lots of reading on this, will def order the guard for the OS and the out-feed pipes as you suggest.

On "another" site, I see that there's 3 plenum drains

Quote:

- under the plenum cover, ns
- to the right of the plenum cover, ns; looks easy to access?
- Under the brake servo, off side

Do all models of the 75 (mine's 2003 ROVER 75 CLUB SE (MANUAL / PETROL)) have the 2nd drain as above, didnt notice that on mine last night?

Hi Charles
All the R40- 75 MGZT models have the four plenum drains, one in each top wing, one under the servo and one to the right of the ECU, after the project drive the OS was filled with a rubber bung instead of a tube to save money ? you can remove this and add the tube if you so wish Arctic.

Jules · 15th December 2015, 14:50

Charles the only way to dry the carpet is to lift the wet side footwells
If you can't take them out completely or soon enough the car will smell musty !

Carpet "may" appear to dry up from above.
But the mould and rot will set in soon enough unless the foam soundproofing is completely dried out underneath. 2 inches thick and holds gallons !!!

If you don't want to remove carpet completely, then lift the affected side of the carpet (remove trims etc)
Place several dry towels under the wet foam and let them soak up the moisture. (car can still be used as long as pedals are not fouled with anything)
Repeat this process each day for 10 days !

Carpet will then be approaching 90% dry.
There's so many 75's about now stinking of mould

If water is found in a front or rear footwell carpet, there will be gallons sitting in the foam sound proofing underneath which is 2 inches thick in places.

If front RH footwell is soaked then the Rear RH will be also.
Water travels front to back or vice versa. (it cannot seap left to right because if the central floor pan tunnel)
So a RH boot leak for example can end up in the RH front footwell after the car has been parked downhill.

Remember water will always find the lowest point.
If you are unlucky enough to have wet LH and RH footwells, there will be 2 or more leaks to trace .

Look for witness marks like a limescale trail if the leak has been there for a while.

Known places for 75ZT leaks are:

Lower Plenum drains blocked, water enters via the pollen filter into heating ducts.

While oval scuttle clips below windscreen.

Missing grommets in bulkhead.

Front sunroof drains come adrift.
at bulkhead. Duck bill ends blocked which need cutting off.

Same applies to Rear sunroof drains. Water enters the boot.

Rear light rubber gaskets split.

Side trims on rear wings.
(2 holes behind each trim need sealing with silicone from the inside)

Cabin exhaust ducts in boot below carpet level. (Seal round edges with silicone)
Rear bumper removal is the most effective as these vents need sealing from the outside.

Drying out process:

Dehumidifier will be futile I'm afraid!

If removing carpet is too big a job for you I suggest lifting the carpet edge up
and use 2 old towels, one under each footwell.

Allow them to blot the water up and then hang towels to dry.
Repeat this about 20 times and the undercarpet foam will then be reasonably dry.
Make sure you find the source of the leak otherwise you'll be back to square one!

Good luck
Jules

PS for Arctic
Steve it was some of the very early cars which had a separation in the plenum area

steve-45 · 15th December 2015, 15:19

Fitted 2 plenium gards today, mine and a chap I work with - amazing what you can do in the works car-park when the boss has taken a days leave for "Christmas shopping".

Hopefully tomorrow - IF ITS DRY - we will silicone in the bottom of the plenium guards.

15th December 2015, 06:55	#123
cy80rg Regular poster Rover 75 Saloon Join Date: Jan 2012 Location: Huddersfield Posts: 54 Thanks: 2 Thanked 2 Times in 2 Posts	Morning all, After noticing water in the drivers side foot well, did my ns plenum last night - sure enough blocked and full of water. Unblocked, and the water drained out. Sponged as much as poss out last night... Have had the heating on "Hi" , using the floor vents to dry it out more. Driving in this morning, the foot well's got about an inch of "dirty" water, and the rear foot wells full again! IN particular, the "bowl" under the drivers seat that the vent is in seems to fill up first - if I didnt know better I'd say the water was actually coming out of the vent? Is this even possible? More likely (hopefully) I just havent mopped it all out yet? FWIW, when I went to refit the carpet trim in the drivers door, the clips were "glued" in with black mastic - I removed this to refit the clips. This is in the upper edge of the body (rather than the underside of the door), so I dont believe water can get in there? Also, I've just had the "reinforced handbreak compensator" mod fitted - anything in there that could have been left off / undone etc, allowing water in? The passenger side of the car is dry as should be. I did the new gaskets in the rear lights last year, and the boots fine. Just looking for some reassurance, or something else to check? Ta, and Happy Christmas! Quick thought... I havent cleared my OS plenum yet - a mate said that as the "drainage area" went across to the other side ("full width") it would drain through the NS plenum I'd cleared... Reading this thread, I see later models didnt go accross like this, so wont drain the OS through the NS drain? Have seen lots of info on clearing the NS drain, but not for clearing the OS (those threads mostly say you only need to bother with the NS). Can anyone point me at such a "how to"? Think I'm gonna have to bite the bullet, get down in the rain and clear both plenums again... oh joy... Also, when fitting the "aquarium foam" mod - which area am I looking to fill, the whole area of the "plenum tank" behind the pollen filter? Last edited by Dragrad; 15th December 2015 at 23:31.. Reason: Consecutive posts - use the edit or Multi-quote :-)

15th December 2015, 09:14	#124
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Have you got a sunroof? http://www.the75andztclub.co.uk/foru...d.php?t=118622 There will be gallons of water under the carpet as the foam sound proofing is 2 inches thick in places ! __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

15th December 2015, 10:17	#126
Arctic Give to Learn Freelander 2 Join Date: Aug 2010 Location: West Midlands Posts: 18,709 Thanks: 1,155 Thanked 6,407 Times in 3,874 Posts	Hi Charles. If the plenum as flooded then that is where the water as got in, on some of the earlier models the centre partition will be there, if this is the case water can and will collect on the OS part of the plenum. You need to get under the car and check both plenum tubes and cut about 20mm off each one, I cut mine at a45 degree angle this is not required it is just the way I like to do it link below. Cut off the first little section in photo one in the link which is clogged up. http://www.the75andztclub.co.uk/foru...ad.php?t=84865 http://www.the75andztclub.co.uk/foru...ad.php?t=86684 Also have a good read through this link if you have not done so already. http://www.the75andztclub.co.uk/foru...89&postcount=1 If I was you I would not glue anything in place and do not put anything into the main plenum chamber, purchase a jules plenum guard for the OS wing area. You could also do this below as a belt and braces http://www.the75andztclub.co.uk/foru...6&postcount=19 The scuttle screen panel can also leak. http://www.the75andztclub.co.uk/foru...3&postcount=61 The spy hole mod http://www.the75andztclub.co.uk/foru...1&postcount=21 Sorry lots of link but quite a few members will get caught out with this really wet weather we are having, and there is more to come, good luck Arctic __________________ Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise " Last edited by Arctic; 15th December 2015 at 21:14..

15th December 2015, 14:50	#129
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Charles the only way to dry the carpet is to lift the wet side footwells If you can't take them out completely or soon enough the car will smell musty ! Carpet "may" appear to dry up from above. But the mould and rot will set in soon enough unless the foam soundproofing is completely dried out underneath. 2 inches thick and holds gallons !!! If you don't want to remove carpet completely, then lift the affected side of the carpet (remove trims etc) Place several dry towels under the wet foam and let them soak up the moisture. (car can still be used as long as pedals are not fouled with anything) Repeat this process each day for 10 days ! Carpet will then be approaching 90% dry. There's so many 75's about now stinking of mould If water is found in a front or rear footwell carpet, there will be gallons sitting in the foam sound proofing underneath which is 2 inches thick in places. If front RH footwell is soaked then the Rear RH will be also. Water travels front to back or vice versa. (it cannot seap left to right because if the central floor pan tunnel) So a RH boot leak for example can end up in the RH front footwell after the car has been parked downhill. Remember water will always find the lowest point. If you are unlucky enough to have wet LH and RH footwells, there will be 2 or more leaks to trace . Look for witness marks like a limescale trail if the leak has been there for a while. Known places for 75ZT leaks are: Lower Plenum drains blocked, water enters via the pollen filter into heating ducts. While oval scuttle clips below windscreen. Missing grommets in bulkhead. Front sunroof drains come adrift. at bulkhead. Duck bill ends blocked which need cutting off. Same applies to Rear sunroof drains. Water enters the boot. Rear light rubber gaskets split. Side trims on rear wings. (2 holes behind each trim need sealing with silicone from the inside) Cabin exhaust ducts in boot below carpet level. (Seal round edges with silicone) Rear bumper removal is the most effective as these vents need sealing from the outside. Drying out process: Dehumidifier will be futile I'm afraid! If removing carpet is too big a job for you I suggest lifting the carpet edge up and use 2 old towels, one under each footwell. Allow them to blot the water up and then hang towels to dry. Repeat this about 20 times and the undercarpet foam will then be reasonably dry. Make sure you find the source of the leak otherwise you'll be back to square one! Good luck Jules PS for Arctic Steve it was some of the very early cars which had a separation in the plenum area __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

13th December 2015, 21:28	#122
MDMH757 Loves to post Rover 75 Tourer Join Date: Mar 2009 Location: Bishop Auckland, Co. Durham Posts: 269 Thanks: 48 Thanked 64 Times in 50 Posts	Oh yes...next weekend , got one in garage .... I reckon that probably the original looking at state of it....

15th December 2015, 10:51	#127
cy80rg Regular poster Rover 75 Saloon Join Date: Jan 2012 Location: Huddersfield Posts: 54 Thanks: 2 Thanked 2 Times in 2 Posts	Thanks Arctic - been doing lots of reading on this, will def order the guard for the OS and the out-feed pipes as you suggest. On "another" site, I see that there's 3 plenum drains - under the plenum cover, ns - to the right of the plenum cover, ns; looks easy to access? - Under the brake servo, off side Do all models of the 75 (mine's 2003 ROVER 75 CLUB SE (MANUAL / PETROL)) have the 2nd drain as above, didnt notice that on mine last night?

15th December 2015, 15:19	#130
steve-45 This is my second home Rover 75 Saloon CDTi Join Date: Oct 2015 Location: Belvedere Posts: 4,076 Thanks: 108 Thanked 1,089 Times in 774 Posts	Fitted 2 plenium gards today, mine and a chap I work with - amazing what you can do in the works car-park when the boss has taken a days leave for "Christmas shopping". Hopefully tomorrow - IF ITS DRY - we will silicone in the bottom of the plenium guards.