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Original Message
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| RE: 66' Fairlane 390 GTA engine oil pressure(update) |
| By mcj67 - 02/16/2001 12:25:59 PM; IP 12.78.122.83 |
Hey Terri, I agree something is not quite right, Fords are famous for lower oil pressure while ideling at operating tempatures, but it should be higher than 10 lbs. The measurments he gave you on the connectong rods are good. But I did not see where you listed what the builder said the camshaft bearing clearances were, or if your builder checked the camshaft bearing clearances when he installed the camshaft.
Just because a new camshaft with new camshaft bearings were installed does -not- mean that the clearances are positivly correct. It's rare (but not unheard of ) sometimes the wrong parts are packaged together, and that is why its best to check the inside diameter of the camshaft bearing in relation to the outside diameter of the camshaft mains to confirm that there is proper clearences, because of the diffculty involved in getting back in there to correct a problem this should be checked at the time of installation.
A lot of builders will skip this check for one reason or another.
The bearings can be measured with a bore gauge before installation, since the inside diameter of the bearing will close up a little once it is driven into its bore you need to allow for this also to get the true size of the inside diameter of the camshaft bearing, than subtract the outside diameter of the camshaft main from the inside diameter of the camshaft main bearing to get the oil clearance of the camshaft bearing.
You stated that the first oil pump had a stuck relieve valve.
If the oil pressure spiked while this pump was installed than the oil gallie plug you mentioned behind the camshaft gear may have pushed out.
Other sorces of internal oil leaks could be.
Excessive bearing clearances, as mentioned
Bad mating surfaces between oil pump and block
Oil gallie plugs- rocker arms, rear of block , front of block, ect.
Cracked block in or around one of the oil passages.
Once you have rulled out everything that you can easly check than it becomes a guessing game
You will have to determin weather to pull it or not.
Do you drive it every day or just for show, will it idel in traffic for long periouds of time?
It's a shame to have to tear it down but if you want it right its starting to look like this is what you may need to do.
Depending on the individual, some people will not put the same amount of time, effort,or enthusiasum into a comeback that they did on the inicial job.I am not saying that your builder will do this, it's just something else to take into consideration when desiding weather or not to pull it and tear it down.
This is about all I can help you with. Gook Luck, Mike Jones |
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