GSF 109

GSF 109

Well-Known Member
Hi all, I have a friend who has offered me his 4.2SC which appears to have bore washed and effectively lost meaningful compression on a few cylinders! It is on gas, so could this have been the issue?
Also, as these engines seem to be costing a fortune second hand - around 3k!!!. is there anyone with knowledge of this issue and any potential fix. I will probably pass on it and run for the hills if I can’t get an engine at a reasonable cost.....
It has just under 100k miles on it and is in reasonable condition. The supercharger needs a new bearing too....
 
Lost compression on "some" cylinders sounds more like broken valves/timing/cams to me.
"IF" it was the lpg caused it, it would be even across the cylinders.
Mine has done 35k that I know about on gas and its fine.
I'd be running for the hills tbh
 
Thanks for your reply. I think the gas conversion was done about a year from new and it’s a 2006, so it’s been running on gas for most of it’s life. The sump has a strong smell of petrol and it’s about a litre over the mark on the dipstick. I believe the AJV8 engines have nikasil type coating on the cylinders. Perhaps that has failed. It’s knackered anyway!!
 
GSF 109 said:
Thanks for your reply. I think the gas conversion was done about a year from new and it’s a 2006, so it’s been running on gas for most of it’s life. The sump has a strong smell of petrol and it’s about a litre over the mark on the dipstick.
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As long as he's offering it to you for free,go for it.
 
If it has LPG and no flashlube, you probably have suffered Valve seat recession, common on an AJV8 that hasn't had flashlube..
do a wet compression test to rule out piston/ring issues.
 
No flashlube is fitted as far as I can tell. I will do a wet test and see what happens. Still confused as to why the fuel is in the sump. The fuel would have to find its way down past the bores surely? Maybe they have been cranking it for a while trying to start it.
 
GSF 109 said:
No flashlube is fitted as far as I can tell. I will do a wet test and see what happens. Still confused as to why the fuel is in the sump. The fuel would have to find its way down past the bores surely? Maybe they have been cranking it for a while trying to start it.
Click to expand...
They more than likely flooded the shít out of it trying to start it.

Pez will leak down past the rings, washing the oil away with it..

Drop some oil down the bores..

It is more than likely VSR which is almost guaranteed on an AJ without flashlube.
 
if the SC bearing has gone, the possibility of the SC vanes being worn are possible. finding a good used one is difficult.
 
I took the supercharger off and the vanes have very light scores on the tips but everything else looks ok.
 
Mine was on lpg when I got it and the date on the ecu is 2009 (it's a 2006 model} so I suspect mine has been on lpg for all but its first 3 years. No flash lube on mine and no sign it was ever fitted.
Pretty sure if it was going to kill the valve seats it would have done so by now.
Nikasil was only very early Ajv8, long before they were fitted to the range rover this problem was fixed.
My vote is still on valve gear failure somewhere.
 
oakey said:
Ok thank you
Click to expand...
Looks like this, lube is drawn into intake manifold and is metered by a screw on the side of the reservoir.
 

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