Space between piston and sliding bushing

[Geri]

Hello everybody!

Now i have a new question to the chevy community here. Hope you have some Advice for me :-)

I disassemble the motor from my 1953 3100 Chevy Truck. It is an 235 Chevy Inline 6 motor. The reason is, i get no compression on it. The grinding work on the cylinder head and the motorblock is now done. The next step is to replace the pistons because one of them has some deep drag marks :-(. I allready take a measuring instrument to get the diameter from the sliding bushing.

Now the question:

The diameter i get from the bushings is 91,6mm. The next smaler size of Piston and Piston Rings i can order from the trader is 91,5mm. So the space between is only 0,1mm!!!!

Is it to small or ok?

For an answer i allready looked in my workshop-manual. But i don´t get any minimum/maximum measurements.
Hope you get an answer for me.

Thanks a lot

Geri

[Denee007]

Hi Geri! I can't help you, but I can say Welcome! I had to look up Seukendorf! Maybe someone here can help you!
dne'

ps: we love pictures!

[dwcsr]

0,1mm should be ok. The minimum/Maximum is 0,0755mm to 0,125mm. 0,0765mm would be better.

[Geri]

Hey Denee, hello dwcsr

Thanks for the fast answer.
Seukendorf is a little village in the State of Bavaria/Germany. We have a big beer party every year. I´m sure you know Oktoberfest .

I will take some pictures from my car and put it here.

Greetz Geri

[mr48chev]

This is the closest I am seeing http://www.northernautoparts.com/Pro...tModelId=30420

That would be what we in the US know as a .040 oversize piston.

You need a bit of clearance for the pistons but I am not positive what the recommended clearance is offhand.

[magicoolbus]

You mentioned your block had machine work, if so: The machinist should have fit the new pistons to the block during the boring/honing process. As you mentioned, you had scoring on one piston, that surely led to scratches on the cylinder bore that would need to be addressed. Also during your reassembly process you will need to ensure that the piston ring gaps are all with in the specified range. Be sure to use plastigage (green) on the rod and crank bearings to ensure adequate clearance, to much, no (or low) oil pressure, to little and you most likely will have a very expensive boat anchor.
Oh, I forgot to add, if your machinist hot tanked the block, you will need a new set of cam bearings!
Be sure to remove the oil gallery plugs and run a gallery brush to clean out any old crud. Don't use the steel hammer in plugs, you need to pipe tap the block and use screw in allen head plugs-use permatex #2. or equivalent sealer.

[mr48chev]

I just had a question pop up in my brain. Are you wanting the clearance between the piston and the cylinder wall or are you wanting the clearance on the wrist pin bushing to wrist pin or piston to wrist pin if they are full floating pistons?

[dwcsr]

No bushing on these rods they clamp on the pin with a bolt