131 twin cam timing marks.

[sid131]

Hi Mark there was a 1980 sport up here that originally had the blue bumpers & arches but the owner painted them black, also there was a grey one with black seats & silver trim, mine had black trim & orange seats, there was a black one with black seats & black trim. if i get talking to the owners i will ask them for some pics  all seem to know i now have another sport!!!!!!!!!!!!!!!!!!

[jasonh131]

1.4 sohc have a plate behind the crank pulley coving the belt , can anyone scan the  other maual not the haynes the auto somthing one and timeing marks

[SteveFX]

Most of my Fiat TC mech experience was with 124's. I owned a few Coupes (Spiders were for sale: If I go dirty-side-up (not YET!) I want at least trivial tin overhead).

Bobdan's OHV timing mark pic was interesting. I never saw such under the sludge on a DOHC motor.

Early owners/repair manuals showed a "holding fixture" that locked all 3 sprockets together; at least on a 1438cc engine. US 1608, 1592, and 1756 engines (Lancias, too) seemed to use whatever aux sprocket the factory worker had at hand. Timing marks were NOT consistent.

I snow/mud bogged a 1438 coupe (no splash pan) and threw an accesory belt very near my rural home. I decided it was time for a timing belt too. I did not clean all of the mud out. Mud dropped onto a sprocket and jumped timing a tooth(18 degrees?). The aux shaft/fuel pump cam hit the #1 (#2, I forget?) rod cap and made more noise at idle than any engine running on less than 4 cylinders ever could. This mistake damaged the aux shaft oil seal and increased oil leakage. That would be considered a serious problem on any other make.

If not sure/if in doubt; rotate the crank to 40-45 degrees ATDC #1 cyl and rotate the aux shaft to find interference. When you do; turn the aux shaft 90 DEGREES either way.

I think by '78/'79; 1756 engines had a larger belt shroud cast into the front cover. All earlier US engines were no problen to bend the T-belt behind the crank pulley...

[SteveFX]

Sorry if I missed the edit function.

A US parts-peddler sold alloy cam sprockets for Fiats. A bit over-tightened T-belt wore 1/3 off of tooth height/width on alloy pulleys on a Lotus 907 in a Jensen-Healey in 700 mi. US 1756 Lancias had GRP cam pulleys. What's the wear story on them?

[rally037]

Hi
I know this thread is old, but a couple of things to add. 

Firstly, you can slip the timing belt on without removing the crank pulley.  There's a way of sliding it in teeth outward and then turning it around the corner at the bottom.  Mine went in very easy (Engine is 131 volumetrico). 

Secondly.... BUT... what I could do with is anyone who has timed the camshafts OTHER than with the standard wheels.  What are the settings?  thanks!