Crankshaft Journals / engine damaged

[abhoyroo]

Can somebody help me, I have 1973 2.4 911T and was advised that I may need a engine rebuild in the not too distant future, the reason was that cranshaft journals are worn. I was told because you can hear them, I have try to listen, but can't hear anything, so what driving condition do I need to do in order to hear any damage.

Also I believe that I have low oil pressure 20 psi at idle, but at initial start-up it's about 70psi. I am being paranoid or do I have a serious problem

Thanks
Adam

[Nick Moss]

Worn journals will give you low oil pressure, your pressure sounds perfect. Ther are several other engine parts that can produce nasty noises: worn pistons, worn intermediate gear, loose cam chains etc. If you have no noises, good pressure and no leaks I wouldn't worry. Who is telling you you have a worn crank?

[fetuhoe]

Just a few thoughts:

What oil are you using and when was it last changed?

20 psi at idle doen't sound too bad depending on oil temperature.

I don't think 70 psi cold at idle is too bad.

What oild pressure do you have at 4000rpm and what oil pressure do you have at 6000rpm

Have you tried listening to the bottom end using a long srewdriver pressed gently on the crankcase. If you can hear a knock at idle I would think it is mains. If the knock is at higher revs it is likely to be big ends.

[abhoyroo]

I took the car to HP motorsport and they told me, but one of the issues is that the car has not had a service since the summer so I am told by the previous owner and my ownership has only been for the last 2 months only.

As for the pressure 20psi when the engine is warm @ 170 degrees approx.
At 4000 rpm I have approx. 45psi approx

I have not checked @ 6000rpm ( too scared to rev that high )

But I am going to try to listen to the crankcase to try to understand the condition of the car.

But I would like to have a second opinion....

Adam

[Mike]

Have you tried listening to the bottom end using a long srewdriver pressed gently on the crankcase. If you can hear a knock at idle I would think it is mains. If the knock is at higher revs it is likely to be big ends.

got this vision of scores of DDK'ers laying under their cars tonight with long screwdrivers

[210bhp]

Have you tried listening to the bottom end using a long srewdriver pressed gently on the crankcase. If you can hear a knock at idle I would think it is mains. If the knock is at higher revs it is likely to be big ends.

got this vision of scores of DDK'ers laying under their cars tonight with long screwdrivers

Not Brendan. He can't hear his big ends for chain rattle

Regards
Mike

[Mike]

Have you tried listening to the bottom end using a long srewdriver pressed gently on the crankcase. If you can hear a knock at idle I would think it is mains. If the knock is at higher revs it is likely to be big ends.

got this vision of scores of DDK'ers laying under their cars tonight with long screwdrivers

Not Brendan. He can't hear his big ends for chain rattle

Regards
Mike

I thought he had had that fixed, I'm not spending a long weekend in Scotland listening to that clatter echo around the glens!

[bjmullan]

Don't you worry Mike all will be well by then.... I hope