V6 Head Gasket Question - Page 2

trikey · 22nd November 2021, 22:50

Quote:

Originally Posted by SideValve

Just a thought - if the water-pump were leaking it would emerge from a drain hole. Wonder it that drain hole could be blocked?

Not always, I have seen the bearings fail and leak through the seals! This then drips down the side of the engine block and beacuse the engine is hot, the leaking water tends to dry up before it makes it's way to the floor.

SD1too · 23rd November 2021, 08:17

Quote:

Originally Posted by SideValve

... if the water-pump were leaking it would emerge from a drain hole.

As Trikey says, not necessarily!

When I was helping another member in the summer we discovered that the steady drip from his water pump was actually coming from a defect in the casting!
The way around the evaporation problem is to inspect very carefully from beneath, immediately after starting the engine from cold. You're looking for the tiniest of drips.

When I had slight but regular loss of coolant it was flattened 'O' rings on the expansion tank cap.

Simon

SideValve · 29th November 2021, 21:39

Well the good news is that I fitted another new coolant cap and after a 20 mile spin the level was still spot on.

I'm not 100% optimistic that its fixed, especially seeing how the previous one was less than a year old, but you never know your luck.

Blummin cars...

Mike Noc · 4th December 2021, 08:01

If you can't find any evidence of coolant leakage why not try a cold pressure test? I knocked up a bit of old hose, a pressure gauge, a scrap tyre valve and a bicycle pump to pressurise the system to around 12 psi and left it overnight.

If the pressure drops with still no sign of leakage whip the plugs out and check the cylinders for dampness.

29th November 2021, 21:39	#13
SideValve Gets stuck in Rover 75 Saloon Join Date: Apr 2012 Location: Oxford Posts: 740 Thanks: 135 Thanked 196 Times in 134 Posts	Well the good news is that I fitted another new coolant cap and after a 20 mile spin the level was still spot on. I'm not 100% optimistic that its fixed, especially seeing how the previous one was less than a year old, but you never know your luck. Blummin cars... __________________ 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.

4th December 2021, 08:01	#14
Mike Noc Relax, it's a Rover. Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,056 Thanks: 3,295 Thanked 3,010 Times in 2,175 Posts	If you can't find any evidence of coolant leakage why not try a cold pressure test? I knocked up a bit of old hose, a pressure gauge, a scrap tyre valve and a bicycle pump to pressurise the system to around 12 psi and left it overnight. If the pressure drops with still no sign of leakage whip the plugs out and check the cylinders for dampness. Last edited by Mike Noc; 6th December 2021 at 14:04..

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