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Old 09-06-2005, 07:43 AM
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Found low oil pressure problem....

G'day Guys n Gals

I thought I should mention a little piece of advice when looking for a low oil pressure problem, as I found today, I checked all bearings with Plastigauge and found them all to be in good shape. There was NO KNOCKS, and the oil pressure was good around 1500+rpm, but at idle there was just about no oil pressure, and my lifters would start to bleed down and tap and tap...

But I found the problem,

As I noticed all the cam bearings where all in very good condition, I diddnt look much further, BUT !!!!!! If you look at the rear cam bearing just in front of the welsh plug, you will see the cam bearing sitting in there, If the engine builder has not put this bearing in properly (far enough) you may not notice that there is a channel under the bearing, the only way you will see is if you knock out the welsh plug. This is where I found the problem, in the channel there are holes that are aprox 20mm apart, the holes were not covered by the cam bearing and this is where the pressure was lost, yea haaaa!!!

I have pulled this engine down twice now, so im pretty happy now it should be fixed, I feel very confidant anyway, lol...

I know of another problem wich is HOLDEN 308 lifters have there oil hole about 1mm down further then on the chev lifter, but all other sizes are the same, as the hole is at a different hight, it will not seal at full lift lossing oil pressure..
These are just the things I had to check while chasing the problem...


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Old 09-06-2005, 08:10 AM
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Great post! While the vast majority of threads deal with problems and possible solutions, you have worded things in manner that someone searching for a similar problem should find this thread. Ed
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Old 09-06-2005, 07:01 PM
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Yes it is absolutely important that these bearings stay where they are meant to be.The Holden engine should have many similarities with the Chevy engine but is not the same.I believe the valve order is different and camshaft too.
When installing these cam bearings,you can actually see through a channel going from the mains towards the cam by turning the engine up side down.But at number 5 I do not think it is possible.What you got? A Morana?Good luck.
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