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adub

Looking for advice...

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Hello all, this is my first post... I'm hoping one of you good folks can help.

I have a 1974 2.7, oil pressure is great when cold, but low when hot, sometimes smokes a little and I've just noticed I can move the crank pulley back and forth. I'm now concerned I need an engine rebuild.

Can someone recommend a good engine rebuild specialist in the Cheshire area for a possible 2.7 engine rebuild?  Thanks in advance Andy.

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Hi there, thanks replying. It's got the Porsche classic 20/50 oil in it at the moment... is there a more suitable choice of oil?

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If in any doubt then suggest you pop over to Jon Holland at Unit 11  - just off M6 Warrington.   Jon knows air-cooled cars inside out and will give you a straightforward and honest view.    

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1 hour ago, topcarrera said:

If in any doubt then suggest you pop over to Jon Holland at Unit 11  - just off M6 Warrington.   Jon knows air-cooled cars inside out and will give you a straightforward and honest view.    

Honest being the most crucial bit. When I first bought my car, he did a good job talking me out of doing the top end in my 3.2 Supersport as it wasn't needed. Just had him do a complete suspension overhaul in March and was very pleased with their work.

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6 hours ago, adub said:

Hi there, thanks replying. It's got the Porsche classic 20/50 oil in it at the moment... is there a more suitable choice of oil?

Fair enough - that should be fine. I thought there was a chance it has something too thin, and the cure might have been a simple oil change... 

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Too much oil maybe.  Movement on the crankpulley doesn't sound good though.

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Have you checked if the pulley bolt has come loose?  Movement due to deformation of the crank case around the number 8 bearing would result in a severe oil leak back there which I am sure you would have mentioned!

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When you say low what pressure are you getting when hot?

Don't trust the gauge, sender or wiring.

Porsche say it is acceptable for the oil light to illuminate at idle with hot oil.

If the car has been shunted around the oil could be contaminated with petrol.

A lack of use can result in a smokey exhaust. If the oil is fresh go for a couple of good 100 mile+runs of mixed driving.

Then see what things are like.

 

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There is an oil leak... which I think is coming from the oil pressure sender sealing washer... I'm looking to purchase a new sender unit and replace the washers. 

Where would it be coming from if it was due to crankshaft wear?

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When replacing the sender, remove it from the engine with the union block (the cube shaped metal block it screws into) still attached. Reason for this is that the aluminium of the sender seizes to the union block making it tough to undo and there is a risk that you'll crack off part of the engine case trying to undo it! Has happened before. Very easy to remove the union and sender by unscrewing the small oil line that enters its side and then unscrewing threaded section that passes through the union. The sender can then be separated safely "on the bench", some find sawing the sender off just above its "nut" base and then getting a socket onto to it.

I'm no expert but a can't see how a worn crank won't cause an oil leak, if the no.8 bearing is leaking its usually because the seal has gone or the magnesium case has warped. Oil would be peeing down into the "well" below the pulley. Put your car in 4th so the engine is locked and then try tightening up the pulley bolt? You might be lucky!

 

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Hello again and thanks for the advice. 

Looking again tonight, there's not as much play as I thought... I'm going to get a dial guage to check it. I don't have any oil leaking into the well below the pulley.

Could be a while, but I'll let you know when I've sorted it ?. 

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Good luck + sorry I meant to say "I can't see how a worn crank won't could cause an oil leak". Happy to be corrected by someone more knowledgeable though!

Cheers

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