|
||
|
20th November 2021, 16:59 | #1 |
Gets stuck in
Rover 75 Saloon Join Date: Apr 2012
Location: Oxford
Posts: 767
Thanks: 141
Thanked 204 Times in 141 Posts
|
V6 Head Gasket Question
I know V6 head gasket problems are meant to be rare but I have a sneaking feeling mine has gone. I've always lost a bit of coolant but lately its got worse. Runs fine. No airlock, No overheating, No drips. No mayo & oil looks fine.
So must be just ingesting it into the combustion chambers Question 1 - is that a common scenario? Or Question 2 - if the HGF is in the rear bank is there any chance that no mayo would be visible in the front? Anyone had something like this?
__________________
The Story So Far: Austin A35, Morris Oxford, Triumph Herald, Mini 850, Mini 1000, Austin Allegro, MG Midget, MGB GT, Rover SD1 2600, Austin Maxi, Rover 200, Rover 825, Rover 800, Bedford TK, Range Rover 3.9 efi, Rover 400, Rover 100, MGF, Rover 25, Rover 75 1.8, Rover 75 Connoisseur SE 2.0 V6, MGF 1.8i, Rover 75 Connoisseur 2.0 V6 Auto, Morris Eight Series E, Morris Minor 1275. |
20th November 2021, 17:12 | #2 |
I really should get out more.......
Rover 75 Saloon Join Date: Jul 2011
Location: Gävle
Posts: 2,537
Thanks: 395
Thanked 823 Times in 652 Posts
|
I wouldn't discount the inlet manifold gaskets leaking coolant into the engine. I know of two cases, there are perhaps more.
Just finishing off a thermostat change at the moment and not the keyhole method as I wish to change the paper inlet gaskets at the same time. Good luck |
20th November 2021, 18:30 | #3 |
Gets stuck in
Rover 75 Saloon Join Date: Apr 2012
Location: Oxford
Posts: 767
Thanks: 141
Thanked 204 Times in 141 Posts
|
Interesting, I hadn't considered that.
I guess I could pull the inlets off and, if they look ok (would it be obvious?), remove the rear rocker cover and take it from there.
__________________
The Story So Far: Austin A35, Morris Oxford, Triumph Herald, Mini 850, Mini 1000, Austin Allegro, MG Midget, MGB GT, Rover SD1 2600, Austin Maxi, Rover 200, Rover 825, Rover 800, Bedford TK, Range Rover 3.9 efi, Rover 400, Rover 100, MGF, Rover 25, Rover 75 1.8, Rover 75 Connoisseur SE 2.0 V6, MGF 1.8i, Rover 75 Connoisseur 2.0 V6 Auto, Morris Eight Series E, Morris Minor 1275. |
20th November 2021, 18:50 | #4 |
I really should get out more.......
Rover 75 Saloon Join Date: Jul 2011
Location: Gävle
Posts: 2,537
Thanks: 395
Thanked 823 Times in 652 Posts
|
Have a look at the image and tell me what you think? It's from a Norwegian V6 that was diagnosed as head gasket failure.
Good luck |
20th November 2021, 19:36 | #5 |
This is my second home
MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009
Location: Oxfordshire
Posts: 4,707
Thanks: 328
Thanked 557 Times in 443 Posts
|
HGF on the V6 does not seem to be as common as on the 1.8's, but I'm sure it does occur.
My V6 dumped 2.5 litres of coolant into the oil over a very short distance. Car limped home with a misfire. Code reader showed front bank lambda sensor. On removal the sensor was caked from the water damage. A replacement sensor tried out of interest and the engine ran fine. Haven't got round to investigating any further, but fairly certain it has HGF on the front bank. Inlet manifold gaskets had been changed. The other possibility on yours could be the oil cooler perhaps? |
20th November 2021, 21:16 | #6 |
Gets stuck in
Rover 75 Saloon Join Date: Apr 2012
Location: Oxford
Posts: 767
Thanks: 141
Thanked 204 Times in 141 Posts
|
I cant completely rule it out but I'd expect some sign of water in the oil if that was happening and I cant see any.
__________________
The Story So Far: Austin A35, Morris Oxford, Triumph Herald, Mini 850, Mini 1000, Austin Allegro, MG Midget, MGB GT, Rover SD1 2600, Austin Maxi, Rover 200, Rover 825, Rover 800, Bedford TK, Range Rover 3.9 efi, Rover 400, Rover 100, MGF, Rover 25, Rover 75 1.8, Rover 75 Connoisseur SE 2.0 V6, MGF 1.8i, Rover 75 Connoisseur 2.0 V6 Auto, Morris Eight Series E, Morris Minor 1275. |
21st November 2021, 07:00 | #7 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,382
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
Small, persistent coolant loss can be caused by flattened 'O' ring seals on the expansion tank cap. Have a look at that. Is the coolant level too high? Can you see the 'MAX' tab inside the expansion tank when you peer inside? When you say "no airlock", could you let us know what you've done to eliminate that possibility? For example, have you drained, refilled and bled the cooling system including raising the expansion tank? Does "no overheating" mean that your engine has passed the radiator fan "demist" test and with the instrument pack diagnostics activated the running temperature is in the low nineties when the car is moving? Oh, and any coolant pools in the 'V'? I cannot stress enough how important it is to check the basics and make no assumptions. Best wishes, Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|
21st November 2021, 17:25 | #8 | ||||
Gets stuck in
Rover 75 Saloon Join Date: Apr 2012
Location: Oxford
Posts: 767
Thanks: 141
Thanked 204 Times in 141 Posts
|
Quote:
Quote:
Quote:
Quote:
V is fine. There is a trace of dried pink round the base of the thermostat but its old and dry. I guess it might have leaked when a previous owner had it but no sign here for 5 years. Thanks for this Simon - I'll do the demist test but I think the next step is to check the inlet gaskets and perhaps peek in the rear rocker.
__________________
The Story So Far: Austin A35, Morris Oxford, Triumph Herald, Mini 850, Mini 1000, Austin Allegro, MG Midget, MGB GT, Rover SD1 2600, Austin Maxi, Rover 200, Rover 825, Rover 800, Bedford TK, Range Rover 3.9 efi, Rover 400, Rover 100, MGF, Rover 25, Rover 75 1.8, Rover 75 Connoisseur SE 2.0 V6, MGF 1.8i, Rover 75 Connoisseur 2.0 V6 Auto, Morris Eight Series E, Morris Minor 1275. |
||||
22nd November 2021, 06:55 | #9 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,382
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Just one more thought Peter; if that were the case I would expect to see a lot of steam from the exhaust. I'm sure you would have mentioned that!
Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
22nd November 2021, 21:11 | #10 | |
Gets stuck in
Rover 75 Saloon Join Date: Apr 2012
Location: Oxford
Posts: 767
Thanks: 141
Thanked 204 Times in 141 Posts
|
Quote:
I'll check tomorrow. The coolant has to be going somewhere but blowed if I can work out where. Just a thought - if the water-pump were leaking it would emerge from a drain hole. Wonder it that drain hole could be blocked? I think I'll have one more go at the checking for air-locks, run a demist check (although if I'm stuck in traffic long enough the fan will come on). Then its pulling the inlets off and the rear cam cover.
__________________
The Story So Far: Austin A35, Morris Oxford, Triumph Herald, Mini 850, Mini 1000, Austin Allegro, MG Midget, MGB GT, Rover SD1 2600, Austin Maxi, Rover 200, Rover 825, Rover 800, Bedford TK, Range Rover 3.9 efi, Rover 400, Rover 100, MGF, Rover 25, Rover 75 1.8, Rover 75 Connoisseur SE 2.0 V6, MGF 1.8i, Rover 75 Connoisseur 2.0 V6 Auto, Morris Eight Series E, Morris Minor 1275. |
|
|
|