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Question re Oil Pump

Frenchy

Frenchy

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Lost oil pressure today gents, luckily on the driveway so knocked the car off top end sounded starved of oil and pressure had dropped, where / how is the oil pump driven ?
 
The oil pump sits on the front end of the crank mate. There is a sleeve that sits over the crank and drives the pump. The only thing that stops the sleeve spinning on the crank is the tightening of the crank pulley bolt. First thing I would check is the pulley bolt to see if it is tight. After that I would look at the oil pressure relief valve in the oil cooler/filter housing. If this fails open it would normally cause low oil pressure but not loss of all pressure. The oil pumps are generally quite bullet proof.
 
Rob's

spot on with his description and opinion = IMHO unlikely to be the pump itself. Things to look at:

1. Oil level/ volume this will help confirm if its a pressure issue or whether you've lost oil

2. Pipes to and from and the oil cooler - very likely culprit for oil loss, leading to low pressure - ask Oli !

3. Oil pressure relief valve and the oil filter/ thermostat housing.

4. Good look over the engine and engine bay to confirm/ check whether oil has been lost

Chris
 
Cheers Rob,
I have just done 1300 miles to Germany and the oil pressure was slightly down on normal, pulled the car out of the garage today and went to move another car, walked back to it and it sounded very tappety, noticed the oil pressure lights on and next to no oil pressure [:(]
Moved the car back and saw the crank pulley bolt lying on the drive, knocked the car off and will be underneath tomorrow with loctite and a torque wrench.
I had changed the belts before Germany and nipped up the bottom bol,t obviously not enough !
Someone from up above must have been smiling on me as if the bolt had let go when "travelling" who knows, hopefully no damage done it was all top end noise and it did not run for long.
 
Cheers Chris also for the reply, i must have been typing the same time as you, fingers crossed that she is sweet when bolted back together, that;s my fishing trip buggered up tomorrow though !!
 
You won't be able to just nip it up mate. You will need a flywheel lock if the engine is in the car. The pulley bolt needs tightening to 200+ nm if my memory serves me correct.
 
Not a chance mate. If it were me I wouldn't risk that. I installed mine while the engine was on the stand by bracing the back end of the crank with a breaker bar threaded through the partially installed flywheel bolts. The bar bent so much I actually thought it was going to break before I got the right torque!!! Maybe just me being a little over-cautious but like I said I would want to have a flywheel lock installed.
 
Cheers for that Rob, we used a pawl device to pick up the teeth on the flywheel to undo, engine is obviously in the car and i do not intend to take it out, just wondering what other people do to tighten the crank / pulley bolt ?
 
From what others have said the flywheel lock is about the only one you can sufficiently get the torque onto the nut. If you were closer I would have loaned you my torque wrench for the job :).
 
Cheers Lads, back together and every thing is happy after an oil change, still needs fully tightened though so no miles until it is done.
 
I had the same prob on my last 86 NA did the belts the few miles later lost oil pressure. You are one lucky guy, to actually have the bolt fall out and not suffer big damage - really its a miracle the pulley didn't pop off. I had damage to the woodruff key and inside of the crank pulley and pas pulley. Think it really really does show the only way you can do this is with a flywheel lock - I used 1st gear - enough said!

Ps if there is any damage to it I have a clean S2 crankshaft pulley for not much!
 
Cheers Strath,
Someone from up above was smiling on me the front pulley was about to chuck itself free, i cannot get over doing 1350 miles and it let's go on the drive at tickover, flywheel lock and big capacity torque wrench for me !
 
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