piston and piston rings

General chat about the car goes in here.
tima01864
Patron 2021
Patron 2021
Posts: 702
Joined: Thu Jan 12, 2012 8:01 pm
Your car is a: 1983 FIAT Pininafarina Spider 2000
Location: Wilmington, MA

Re: piston and piston rings

Post by tima01864 »

I had a thought. The timing belt, on mine, Does not ride centered on the cam wheels. Would it help to leave the head bolts loose or finger tight, Install the belt and move the cylinder head forward or back. Rotate the engine two turns until the belt rides on the center of both cam wheels. Then tourque the head bolts.
18Fiatsandcounting
Posts: 3798
Joined: Fri Mar 15, 2019 11:23 pm
Your car is a: 1969 and 1971 124 spiders
Location: San Francisco Bay Area

Re: piston and piston rings

Post by 18Fiatsandcounting »

tima01864 wrote:I had a thought. The timing belt, on mine, Does not ride centered on the cam wheels. Would it help to leave the head bolts loose or finger tight, Install the belt and move the cylinder head forward or back. Rotate the engine two turns until the belt rides on the center of both cam wheels. Then tourque the head bolts.
As long as the belt is fully riding on all the pulleys (that is, not running past the edge of any pulley), you should be good. Also, with the block-to-head locating dowels in place, there's not much ability to move the head around. If you could, I'd start worrying about head gasket sealing and clearances within the combustion chamber.

-Bryan
tima01864
Patron 2021
Patron 2021
Posts: 702
Joined: Thu Jan 12, 2012 8:01 pm
Your car is a: 1983 FIAT Pininafarina Spider 2000
Location: Wilmington, MA

Re: piston and piston rings

Post by tima01864 »

Those dowels have play to the head, Not much. I had thought of machining Dowels to fit head to block 1 to 1. But wonder why are not from the factory.
eyal76
Posts: 8
Joined: Fri Jun 19, 2020 8:21 pm
Your car is a: 1976 fiat 124 spider

Re: piston and piston rings

Post by eyal76 »

thanks for your help the car no longer is spewing out blue smoke happy new year!
Post Reply