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Join Date: May 2005
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Bottom end knocking!!

My nightmare with my 85 3.2 Carrera continues..... Have had the tensioners done on the car, tappets and rockers checked. I now have a clanging noise from the bottom end my oil pressure is good and there was no debris in the oil. Before I spend a serious amount of pound notes has anyone got any ideas? Thanks again for your help, Ian.
Old 07-21-2005, 08:46 AM
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The only idea that comes to mind is that you speak with a Porsche specialist/friends-remain objective- and weigh all your options carefully.

Was it making the same noise before?

You have a few options. If it is done right you will have a very nice car when you are done.

Good luck.

Regards,
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Old 07-21-2005, 12:19 PM
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The noise is new!

The noise is new!
Old 07-21-2005, 12:55 PM
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Is it knocking or clanging? Knocking is likely to be rod knock from a bad bearing. Clanging is more likely to be from a chain hitting something. Maybe the tensioners were installed wrong. A chain could be off of one edge of a sprocket (duplex chain installed on one edge instead of both). Of course these are only guesses. You probably need to take it to a shop that knows these engines to have it checked out.

-Andy
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Old 07-21-2005, 01:17 PM
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Then probably rod bearing no.2 or no. 5 went bad. I would not run the car for fear of damaging the crank.
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Old 07-21-2005, 01:59 PM
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Piston slap can be very noisy but should quiet down as the engine warms up..
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Old 07-21-2005, 02:09 PM
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Any backpressure from the blowoff valve (rocker problem).

Have you opened up the oil sill plate and inspected (3.2 might not have these though).

What have you done so far?
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Old 07-21-2005, 02:15 PM
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Is it RHD? Because if it is, you are in serious trouble. You should immediately pack the car in bubble-wrap, put it in a container, and send it to me.
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Old 07-21-2005, 03:22 PM
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Today, pull the magnetic drain plug. Is it clean? How did it look last oil change?
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Old 07-21-2005, 09:04 PM
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Try shorting out (disconnecting spark) each cylinder in turn. If a cylinder has a bad rod bearing, this will reduce knocking. If the knock still persists, it's probably not a rod bearing. it could be a main bearing or one of the others mentioned.

Hope this helps a little,
Sherwood
Old 07-21-2005, 11:27 PM
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Ian - does the knocking go away when the engine is warm?
Old 07-21-2005, 11:30 PM
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