mark928gt

Tonight I checked all the conrod clearances. All the bearings looked good with no significant wear or copper color showing at all. Only number five showed much of a wear pattern. See pic.

Here are my clearance readings using green Plastigage. Of course they are an estimation since the Plastigage scale does not match exactly.

#1 - .045mm
#2 - .049mm
#3 - .045mm
#4 - .042mm
#5 - .042mm
#6 - .049mm
#7 - .042mm
#8 - .042mm

With new bearing play being specified as .02 - .07 mm and a wear limit of 0.10mm should I replace the bearings anyway or leave them alone and just put new nuts on?

Thanks.

GregBBRD

If that is the worst rod bearing, put new nuts on and forget it.

Bill Ball

Wow! How many miles? Someday I should check mine.

mark928gt

The car has 85k on it. The outside of the engine was filthy but I've been happily surprised how clean the inside has been. The PO was pretty **** and I've changed the oil every 3k with Mobil 1 for ten years before my timing belt gave way.

namasgt

How old was the belt when it failed? (how many years and miles)

mark928gt

The belt was 10 years old and had about 25,000 miles on it. I checked the tension and belt condition regularly. I wonder now if I was over tightening it.

When the failure happened the belt did not break in two. It sheered a bunch of the teeth off of the belt. When I took things apart I found the cam pulleys were really worn. I'm not completely sure if part of the belt gave way or if the pulleys were worn enough to allow it to slip or???

I don't think I will let a belt get that old again, regardless of how good it looks. I also will always check for wear on the pulleys to make sure they are not wearing too much.

Either way. I'm learning lots and really enjoying the project of working on the car.

namasgt

Could have been age related, Porsche recommends changing the timing belt every 5 years regardless of how low the miles are on the belt. So your belt was passed due by 5 years, until it gave up.

mark928gt

I won't do that again.