minto4
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| posted on 11/6/08 at 10:50 PM |
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Pinto Engine Oil pump Troubles
HI all,
i posted a problem last month relating to v low oil pressure on my pinto that i had been working on through the winter.
Any hoo i found the cause of this being the pressure relese valve that is built into the oil pump had stuck open for whatever reason. By the time i
spotted this i had already purchased a new pump so fitted the new one anyway.
Once it was all back together again i started the engine and all was well again, readings taked from a sykes pickervance or whatever their called
guage showed 80-90 psi of pressure as before the problems started, although after reasing and talking to a number of sources it sounded like this
reading could be a little high but as the engine has been to france twice and a couple of thousand miles aswell i thought it was ok.
Now at the start of the month i did 20-30 miles in the car with no problems at all, but as of tonight after my dad coming over to take the car to
their house to try and get some miles on it before next month (LeMans classic) he set off and did about 1 mile to put some fuel in it and woosh, no
pressure again.
Im guessing that it will be that same problem again with the pump but we are completley in the dark as to what could be causing it.
I hoping to make some phone calls to various companys tomorrow mainly the company that built the engine in the first place (specialized engines) in
essex to see if anyone can shed any light in it, but am hopeing that someone reading this might have had the same problem or might know what it is.
As were off to france on the 9th of next month im now getting very worried about the whole thing.
Any how thanks for reading and if you have any suggestions for me please post what you can.
Cheers, Ben.
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Dusty
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| posted on 12/6/08 at 12:27 AM |
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Oil pumps have to be well aligned with the hex drive shaft/dizzy shaft on the pinto before being bolted up. To get this right ford made a hollow dowel
that fits into the top of the pump and the bottom of the block. Did you use this? If not you can fatigue and snap the pump drive hex.
Also not impossible to have the pickup pipe or pump bolts come loose and suck air.
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ash_hammond
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| posted on 12/6/08 at 07:35 AM |
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What do u call no pressure?
My pinto runs about 60psi when cold and 40 to 50ish when hot. This is also a newly build engine that has only covered 700 miles, so things are still
a little light. However 80psi does sound on the high side.
HTH
Ash
.: www.mac1motorsports.co.uk | www.m1moc.com :.
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David Jenkins
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| posted on 12/6/08 at 09:47 AM |
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My x-flow suffered from a stuck oil pump relief valve 2 or 3 times, until the oil had been changed once or twice.
There may be some muck going round your oil-ways. If the valve is stuck again, I suggest that you free it off, clean things up as best you can, then
do an oil and filter change.
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jollygreengiant
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| posted on 12/6/08 at 10:15 AM |
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I came across a Honda once that had the oil pressure relief valve stuck. This was caused by the failure of A main bearing. The bearing material had
failed and was coming of and into the oil in little flakes that caused the pump relief valve to stick. The offending main bearing journal was beyond
repair but was not knocking due to excessive oil pressure.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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minto4
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| posted on 13/6/08 at 03:11 PM |
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Thanks for your replies guys.
To let you know we sorted the problem last night, i had indeed not swappes our the locating ring into the new pump when i fitted it whic probably
caused it to be out of line, thus causing stress no doubt on the shaft resultin in it sheering.
Replaced the shaft and the locating ring and its all now rosey.
As stated the oil pressure is normally 80-90 psi when cold tickover dropping to approx 50 when warm but as soon as the revs pick up its straight back
to 80 psi which after chatting to the guys at specialised engines in essex who origionaly built the engine he assures me that is the perfect pressure
for a correctly cleared engine.
Any how hopefully all is now well and well have trouble free motoring from now on.
The new piper 285 cam feels great but now could just do with getting the megajolt tweeked to iron out the blips.
Cheers all,
See you at LeMans in July.
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