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theiceman's Avatar
 
Join Date: Feb 2006
Location: Ontario Canada
Posts: 2,947
Just a few quick questions

Was having a good chat with my buddy as he is tearng down an engine/transmission. ( 3.2)

We got into a few discussions I thought I would ask the brain trust.

1. The p in the triangle in the 915 casing indicates a Porsche part. Following it came the g50 designed by getrag. Does the 915 mark the last transmission designed by Porsche for production vehicles ?

2. The engine he is looking at I know... Smoked a lot when cold, and also when really hot, and idling... But shoes zero signs of valve wear in the traditional sense. Coasting down a hill.in gear for example. So we are thinking maybe rings... cyl 5 shows oil in the cylinder when cold.
He also took 3-5 litres out of crankcase when draining which might explain a lot too.
What causes the drain back and some cars to do it and others not ? Is it essentially a failure of seals in the scavenge pump and it's leaked back ? I know there is a valve available but was curious about route cause..
3. Second and third gear synchro is shiney , done... But is it automatic you replace dog teeth too ?

When I did my engine I did all new rsr seals and rocker arms. Yet it still leaks. Even increased torque a little... I just gave up and let it drop on exhaust as it's back breaking work. Is there anything he can do different ?

Thanks for any info.

Ice

Old 05-28-2021, 04:21 AM
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Join Date: Dec 2019
Location: Pasadena, CA
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1) For the air-cooled cars, yes - 964 and 993 had evolutions of the g50. For water-cooled, PDK was developed by Porsche in the 80s for racing and finally made it into production ~30 years later in 2009.

Wouldn’t know enough about your other questions to answer myself, still new to this Porsche world. Looking forwarding to learning from the hive though

Last edited by FloydPink; 05-28-2021 at 05:27 AM..
Old 05-28-2021, 05:22 AM
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That's good info about the gearbox though. Another thing to be proud of owning a 915... ☺️

Old 05-28-2021, 06:27 AM
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