Oil flow (or lack thereof)

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unstable load
Top Dog
Top Dog
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Joined: Mon May 04, 2009 6:53 am

Post by unstable load »

Remove the remote connector and with the plugs out and a bucket handy, crank the motor ans see what comes out, if that's good, refit the remote and go to the next connector down stream and repeat and repeat until you have done the whole system stage by stage to eliminate each part individually.

I know a guy that cooked a turbine because the vendor of a part had plugged an AN fitting with a plastic plug as he should have, but it got dropped/bumped and sheared the outer part of the blank off and left a nice round disc in the pipe to effectively render the motor scrap in about 2 minutes after startup....


Cheers,
John
AdamR
Newbie
Newbie
Posts: 16
Joined: Sat Feb 17, 2007 7:29 pm

Post by AdamR »

Thought I'd resurrect this old thread to let anyone who's interested know what I found out when I had a chance to look at this again over Christmas.

To recap - I was originally suspicious about oil flow as I was seeing very little oil oozing from the rockers at idle, despite my mechical gauge reading good pressure of 40psi. I pulled off the rocker shafts and observed very little oil being fed through the oil way - and this convinced me I had a problem.

So, I basically went through a very lengthly process of ruling out possible causes - checked oil ways were not blocked, checked PRV, tried various pickup and sump combinations, swapped the remote filter connections and then removed altogether. I had the front cover off to inspect the crank driven pump, but everything looked good. Eventually I bought a new interim timing cover including new pump and PRV and fitted that. None of the above made any difference at all, and I still had a feeble flow of oil oozing from the rocker oil feed hole when cranking the engine on the starter.

I was just starting to convince myself that I'd elimated every possible cause and therefore the engine must be OK - but decided that whilst the engine was in bits I may as well pull the plenum and inlet manifold off for one last check, and to make some planned changes to the cooling system.

As soon as I pealed off the valley gasket I could see the problem! Right back when beginning the troubleshooting process I had removed the rocker assemblies and pulled out the pushrods. Without me knowing this had dislodged 3 cam follwers, which had been pulled clean from their bores and were lying loose in the valley. Most of the oil pressure was therefore being lost from the uncovered lifter oil ways. As soon as I popped the cam followers back in their holes and cranked the engine I had a continuous strong spurt of oil pumping from the rocker oil feeds - much more like what I'd been expecting in the first place. Conclusion - there was no problem in the first place. D'oh! Happy to put it down to experience though, and have certainly learnt a lot about my engine in the process.

I do have a new oil related issue - seems par for the course with Rover V8s. Will start a new thread for that...
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