CDTi Water Leak

Halkyon · 9th June 2017, 19:07

Six months of trouble free motoring (if we don't mention the fan controller and injectors 3 & 4) and my 75 CDTi has sprung a leak, causing the coolant to drain and an overheat.

I topped up the radiator and ran the engine - I think I located the leak.

Can I patch this hose, or best to replace? Also what is it?

Heddy · 9th June 2017, 20:16

It's a bleed hose, hence the knob on the top. On my car it's incorporated in the FBH (fuel burning heater) circuit. It's always best to replace a damaged hose.

GeoffWW · 9th June 2017, 20:53

It looks like you have two leak points here, the hole in the piping, and possibly the joint above it below the knurled vent cap.

The cap is the vent screw, like a brake bleed nipple, for bleeding air out of the "twists" of water coolant piping in front of the battery box where the FBH would be, if fitted. The piping is marked where to cut and remove the excess piping when fitting the FBH.

My vent screw developed a leak a couple of years ago and I stopped the leak by
1. Raising the knurled cap/ vent valve, as high as the piping will allow, stopping the water leaking out
2. Unscrewing, it may be quite stiff and need supporting the hose under the cap the knurled cap part way, and inserting a bead of the blue gasket cement around the gap and then re-tightened the cap. That cured the leak.

For the hole in the side of the piping, could you plug it with a small "pyramid" in rubber that could be pushed/wedged into the hole, without going right through and stuck in place with rubber cement.

I have just had an idea, using the plugs that are fitted in the plastic trim at the base of the windscreen, but not sure of the security of sticking plastic to rubber.

Or fitting a small nut and bolt with wider washers inside and out, through the hole, then tightening them together, again with sealant between the sealing surfaces.

GeoffWW · 9th June 2017, 21:28

.....Just had a look at Rimmers and found the hose https://www.rimmerbros.co.uk/Item--i-PCH119334 and it costs £44.

See the extra note on the part register number 11, (the hose) which mentions the difficult-to-see vent valve.

Halkyon · 9th June 2017, 22:17

Thank you chaps that's super useful!

Halkyon · 10th June 2017, 19:28

Self-amalgamating repair tape is holding so far after ~25miles in 20 degree heat. I don't really have £44 to spend on a new hose at the moment!

9th June 2017, 19:07	#1
Halkyon Regular poster Rover 75 Saloon Join Date: Jan 2017 Location: Huntingdon Posts: 35 Thanks: 8 Thanked 9 Times in 7 Posts	CDTi Water Leak Six months of trouble free motoring (if we don't mention the fan controller and injectors 3 & 4) and my 75 CDTi has sprung a leak, causing the coolant to drain and an overheat. I topped up the radiator and ran the engine - I think I located the leak. Can I patch this hose, or best to replace? Also what is it? __________________ The Fleet: Morris Minor 1000 Saloon (1968) Rover 75 Connoisseur 1.8 (2002)

9th June 2017, 22:17	#5
Halkyon Regular poster Rover 75 Saloon Join Date: Jan 2017 Location: Huntingdon Posts: 35 Thanks: 8 Thanked 9 Times in 7 Posts	Thank you chaps that's super useful! __________________ The Fleet: Morris Minor 1000 Saloon (1968) Rover 75 Connoisseur 1.8 (2002)

10th June 2017, 19:28	#6
Halkyon Regular poster Rover 75 Saloon Join Date: Jan 2017 Location: Huntingdon Posts: 35 Thanks: 8 Thanked 9 Times in 7 Posts	Self-amalgamating repair tape is holding so far after ~25miles in 20 degree heat. I don't really have £44 to spend on a new hose at the moment! __________________ The Fleet: Morris Minor 1000 Saloon (1968) Rover 75 Connoisseur 1.8 (2002)

9th June 2017, 20:16	#2
Heddy This is my second home None Join Date: Feb 2013 Location: None Posts: 5,556 Thanks: 465 Thanked 1,161 Times in 924 Posts	It's a bleed hose, hence the knob on the top. On my car it's incorporated in the FBH (fuel burning heater) circuit. It's always best to replace a damaged hose.

9th June 2017, 20:53	#3
GeoffWW Loves to post Rover 75 CDTi Tourer Connoisseur SE Auto, Also fully restored Mk 2 1966 MG Midget Join Date: Apr 2007 Location: Manchester Posts: 314 Thanks: 49 Thanked 59 Times in 46 Posts	It looks like you have two leak points here, the hole in the piping, and possibly the joint above it below the knurled vent cap. The cap is the vent screw, like a brake bleed nipple, for bleeding air out of the "twists" of water coolant piping in front of the battery box where the FBH would be, if fitted. The piping is marked where to cut and remove the excess piping when fitting the FBH. My vent screw developed a leak a couple of years ago and I stopped the leak by 1. Raising the knurled cap/ vent valve, as high as the piping will allow, stopping the water leaking out 2. Unscrewing, it may be quite stiff and need supporting the hose under the cap the knurled cap part way, and inserting a bead of the blue gasket cement around the gap and then re-tightened the cap. That cured the leak. For the hole in the side of the piping, could you plug it with a small "pyramid" in rubber that could be pushed/wedged into the hole, without going right through and stuck in place with rubber cement. I have just had an idea, using the plugs that are fitted in the plastic trim at the base of the windscreen, but not sure of the security of sticking plastic to rubber. Or fitting a small nut and bolt with wider washers inside and out, through the hole, then tightening them together, again with sealant between the sealing surfaces.

9th June 2017, 21:28	#4
GeoffWW Loves to post Rover 75 CDTi Tourer Connoisseur SE Auto, Also fully restored Mk 2 1966 MG Midget Join Date: Apr 2007 Location: Manchester Posts: 314 Thanks: 49 Thanked 59 Times in 46 Posts	.....Just had a look at Rimmers and found the hose https://www.rimmerbros.co.uk/Item--i-PCH119334 and it costs £44. See the extra note on the part register number 11, (the hose) which mentions the difficult-to-see vent valve.