1.8T coolant hoses keep splitting

Robti · 23rd December 2018, 19:57

Hi brothers car has just had its head done and new turbo and since then has had 2 coolant hoses split, any ideas if there is a fault or just a coincidence and old age ?
Thanks

trikey · 23rd December 2018, 20:02

Quote:

Originally Posted by Robti

Hi brothers car has just had its head done and new turbo and since then has had 2 coolant hoses split, any ideas if there is a fault or just a coincidence and old age ?
Thanks

I would replace all the hoses with new to rule out age / OAT degradation and go from there.

Robti · 23rd December 2018, 20:29

Thanks he came up with a thought of a blocked oil cooler causing an increase in pressure, so we can assume it’s just old age then

trikey · 23rd December 2018, 20:40

If its not aged hoses, it could be pressurising of the cooling system, do you know if the hoses felt hard before they split?

Robti · 23rd December 2018, 21:40

No really soft when we were bleeding the coolant I was squeezing the hoses and the top hose was just the same as the one from the Tee to the stat that had burst soft rubber

Lovel · 23rd December 2018, 22:32

Oil (once the elastomer bead bond on the head gasket is broken enters the cooling system) is wonderful at swelling up and weakening the hose material EPDM, this coupled with the inferior manufacturing (like a rolly polly) process on the dimpled turbo model coolant hoses can lead to early failure. Your better obtaining the later SAIC smooth one piece hoses which are more rugged although are still made with EPDM and will still swell when exposed to hydrocarbons.

Robti · 24th December 2018, 05:25

Thanks everyone for the helpful replies I will let him know what you are all saying.

SD1too · 24th December 2018, 07:52

It's interesting that it always seems to be the 1.8T which suffers hose failure. I don't know the answer but I'd say Lovel's theory shouldn't be ignored.

By the way, as for the "old age" argument, all the hoses on my 1999 KV6 are original. What's more, I've never had a coolant hose failure on my SD1 either and they are 35 years old now!

Simon

Yorkshire GOC · 24th December 2018, 12:39

Quote:

Originally Posted by Robti

Hi brothers car has just had its head done and new turbo and since then has had 2 coolant hoses split, any ideas if there is a fault or just a coincidence and old age ?
Thanks

I would invest in a full set of silicone hose - they are far more robust than the MGR rubber hose - mine failed as it entered the t-piece - just disintegrated - so i invested in a silicone set from

http://www.mkperformancehose.co.uk/

They usually have a 1.8t set on e-bay as well.

Lovel · 24th December 2018, 17:02

Dow Corning silicon grease is perfect for these applications on the o-ring and sealing surface. No scraped knuckles when trying to remove

and so easy to instal. Provides some form of barrier to the elastomer too. I use it On equipment at elevated temperatures and pressures with nasty fluids, but off course my stuff has usually double o-ring and peek trapezoidal back up rings.

23rd December 2018, 19:57	#1
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,968 Thanks: 616 Thanked 228 Times in 210 Posts	1.8T coolant hoses keep splitting Hi brothers car has just had its head done and new turbo and since then has had 2 coolant hoses split, any ideas if there is a fault or just a coincidence and old age ? Thanks __________________ Robert

23rd December 2018, 20:29	#3
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,968 Thanks: 616 Thanked 228 Times in 210 Posts	Thanks he came up with a thought of a blocked oil cooler causing an increase in pressure, so we can assume it’s just old age then __________________ Robert

23rd December 2018, 20:40	#4
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,765 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	If its not aged hoses, it could be pressurising of the cooling system, do you know if the hoses felt hard before they split? __________________ Lest we forget..

23rd December 2018, 21:40	#5
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,968 Thanks: 616 Thanked 228 Times in 210 Posts	No really soft when we were bleeding the coolant I was squeezing the hoses and the top hose was just the same as the one from the Tee to the stat that had burst soft rubber __________________ Robert

23rd December 2018, 22:32	#6
Lovel I really should get out more....... P6B, L550, Imp, F56, Commando Join Date: Nov 2006 Location: Aberdeenshire Posts: 2,886 Thanks: 352 Thanked 677 Times in 440 Posts	Oil (once the elastomer bead bond on the head gasket is broken enters the cooling system) is wonderful at swelling up and weakening the hose material EPDM, this coupled with the inferior manufacturing (like a rolly polly) process on the dimpled turbo model coolant hoses can lead to early failure. Your better obtaining the later SAIC smooth one piece hoses which are more rugged although are still made with EPDM and will still swell when exposed to hydrocarbons. Last edited by Lovel; 24th December 2018 at 06:17..

24th December 2018, 05:25	#7
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,968 Thanks: 616 Thanked 228 Times in 210 Posts	Thanks everyone for the helpful replies I will let him know what you are all saying. __________________ Robert

24th December 2018, 07:52	#8
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,345 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	It's interesting that it always seems to be the 1.8T which suffers hose failure. I don't know the answer but I'd say Lovel's theory shouldn't be ignored. By the way, as for the "old age" argument, all the hoses on my 1999 KV6 are original. What's more, I've never had a coolant hose failure on my SD1 either and they are 35 years old now! Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 24th December 2018 at 08:06.. Reason: Addition

24th December 2018, 17:02	#10
Lovel I really should get out more....... P6B, L550, Imp, F56, Commando Join Date: Nov 2006 Location: Aberdeenshire Posts: 2,886 Thanks: 352 Thanked 677 Times in 440 Posts	Dow Corning silicon grease is perfect for these applications on the o-ring and sealing surface. No scraped knuckles when trying to remove and so easy to instal. Provides some form of barrier to the elastomer too. I use it On equipment at elevated temperatures and pressures with nasty fluids, but off course my stuff has usually double o-ring and peek trapezoidal back up rings. Last edited by Lovel; 24th December 2018 at 17:04..