135 psi on one cyl - V8

[ozscott]

Hi all,

2001 V8 D2 Manual.

Discovered the cause of a long time slowish leak - water pump which finally failed the other day. It got a little hot on the scan gauge II but pulled it over quickly when she got to 110. It has been a little hotter before when I screwed the coolant header tank lid on incorrectly...the low water alarm went off but I ignored it for a while because it had been getting air int he system and had been going off...crying wolf and all that.

A compression test now shows dry with all cylinders at 190-210 but with number to a 135 and number 3 at 175. Wet number 2 goes up to 175-180.

I assume then I am looking at a head failure - probably valve - this baby has been running LPG for the last 90,000 odd klms. i have owned the truck since new and she is now 11 years old and 187,000k.

Any suggestions - I was thinking crack testing heads and head reco only...

Cheers

[ozscott]

Had an interesting chat to Triumph Rover spares who reckon if the motor is running smoothly with plenty of power (which it has) that variance is not a drama and just to keep running her. They say compression readings are high on the others anyway (the compression test though was done with injections still going...).

Good I reckon, but doubt that she will reach the nearly 300,000k that my D1 V8 has on her.

Cheers

[Blknight.aus]

do a leakdown test.

[ozscott]

Thanks Dave - there are many variables in the compression test, but I think given how well its running (cold and hot starting, under heavy load, very hot and cold weather etc) that I am better off not chasing problems, and just sticking on the water pump and driving it.

Cheers

[Blknight.aus]

leakdown test...

what if its coming out on the seam of the gasket, a bulge in the liner?

a leakdown test takes all of 5 minutes to do (especially since you only need to do it on one pot) to give you a rough look at where the problem is.

[ozscott]

Thanks Dave

Cheers