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Ben's (an emotional quandry) 1975 SE5a

Posted: Fri Dec 07, 2018 9:13 am
by scimjim
Doesn’t sound like a PRV problem but you can push the spring when the sump is off to check it’s moving smoothly.

What spec is the running in oil? It comes in various viscosities.

Ben's (an emotional quandry) 1975 SE5a

Posted: Fri Dec 07, 2018 9:49 am
by AJL Electronics
A quick and easy test is to replace the oil filter. Might save all that work! If not, you have a spare ready primed for next time.

Ben's (an emotional quandry) 1975 SE5a

Posted: Fri Dec 07, 2018 10:38 am
by Old and Slow
The only time something similar happened to me was when they rebuilt the crank (reground 30 thou undersize) and fitted standard shells. Hope it isn't this.

Ben's (an emotional quandry) 1975 SE5a

Posted: Fri Dec 07, 2018 1:05 pm
by roymck
Some engines have oversized main bearings housings by 15 thou line bored by Ford to reclaim blocks that might otherwise have been scrapped . These need special main bearing shells to fit the oversized block, fit a standard shell you will have problems.
Hope that’s not your problem ?

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 1:49 pm
by scmarf
Update:
Dropped sump and swapped oil pump for old one ; no change.
Dropped sump again and fitted new oil pump back in and filled with 20/50 : marginal increase but still down to about 10psi at 2500rpm hot.

To do:
1) swap oil filter
2) swap oil gauge
3) plastigage on bearings (not sure if it works on main bearings in situ as the crankshaft would be constrained by its own weight plus external loads)

Didn't notice any clearances when assembling crank.

What am I missing?

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 1:51 pm
by scimjim
Swap gauge just to check? It’s low across the whole range, so it may possibly be the gauge.

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 3:49 pm
by scmarf
Just swapped gauge and hose (admittedly for another old gauge) - no difference.
Just swapped filter - no difference.

Next, swap gauge from the one out of the 6a.

After that, :?:

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 3:51 pm
by philhoward
How did the pickup look? Any signs of a hairline crack (normally where the bracket is)?

Chances of 2 gauges being equally duff is very slim to be honest.

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 4:06 pm
by Coupe Racing
Have you replaced the camshaft bearings

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 4:35 pm
by scmarf
philhoward wrote:
Mon Dec 10, 2018 3:51 pm
How did the pickup look? Any signs of a hairline crack (normally where the bracket is)?

Chances of 2 gauges being equally duff is very slim to be honest.
Couldn't see any problems and I looked pretty closely.
Coupe Racing wrote:
Mon Dec 10, 2018 4:06 pm
Have you replaced the camshaft bearings
No. Original camshaft re-ground so assumed not a problem. :?:

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 5:02 pm
by Coupe Racing
Is the block flat where the pump is mounted
I'm with some others ref the pick up pipe leaking

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 6:56 pm
by scmarf
Coupe Racing wrote:
Mon Dec 10, 2018 5:02 pm
Is the block flat where the pump is mounted
I'm with some others ref the pick up pipe leaking
Yes.
I can only say I gave the pick-up a thorough examination on initial fitting and again on Friday before re-fitting the third time.

Tomorrow I will drop the sump for the third time and check bearing sizes. Those are the only things that have been changed and not checked now. Although I trust my engine man, I really don't know what else to check now.

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 7:46 pm
by Coupe Racing
Taken from the manual , might be worth a read

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 7:48 pm
by Coupe Racing
Part 1

Ben's (an emotional quandry) 1975 SE5a

Posted: Mon Dec 10, 2018 7:49 pm
by Coupe Racing
Part 2