hey all

im currently having some timing issues.

how do i go about finding the TDC of the crank, and TDC of the cam?

the car is currently in pieces, and need to get it sorted as soon as

isnt this info in the guides and/or faqs?

dave said:

isnt this info in the guides and/or faqs?

Click to expand...

yes it is with a pic

Ash

well top dead centre of the crank is with the piston at the top on cylinder one. so if you have the head off. turn the crank so that the piston in cylinder 1 is at the point where it stops for a moment before going back down. the cam pulley should have a mark. if not do it to the point where both valves on cylinder 1 are closed

crank has a mark on it that lines up to the top of a casting on the rear of the engine, take the alternator pully off and it will be obvious!

im sure the cam has a similar thing

Ming

easier to find TDC by removing the cover in the gearbox housing. On the flywheel is a mark that lines up with the timing marks in there. Also means you don't need to remove the alternator belt and pulley

depends if its had a engine swap and they left the plate with the marks out...as ive seen often

hmmm surely is easier to remove the alternator pulley compared to removing the gearbox?

ycming said:

hmmm surely is easier to remove the alternator pulley compared to removing the gearbox?

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i dont think he meant the whole box ming just the observation panel

yep there is a large square bung/vent on the top of the bell housing. there is a plate with arrows on it and iirc -5 0 5 10 15 degrees and a notch on the flywheel.

guess its fiats leftovers from the engines dizzy days... also a god send for us megasquirt lot

Aye, not the whole box ming, that would be a pain lol.


Source:

https://www.fiatforum.com/uno/9942-cam-belt-timing-marks.html?p=228268

I just put a long screwdriver in the sparkplug hole and ull see him go up when u turn the pulley thats how i found it.. old school but works for me

use a chop stick or something soft to save taking chunks out the piston

use thick solder, chop stick might snap off inside

Mate that is mint!!! Learn something new everyday!

so 5 10 15, is the number of degrees you advance the timing by ?

Ming

dave said:

use thick solder, chop stick might snap off inside

Click to expand...

plasic shopsticks that come with a takeaway... they dont snap

ming your flywheel does not have any marks on it..... they went in the bin when it was billeted

The chopstick method will be safe enough in an 8v (but remember that the plug hole is at an angle). Safest way (assuming the cam cover is off, is both valves shut (lobes pointing skyward) on No.1 cylinder. This gives you TDC on compression stroke on No.1. As the cam pulley is keyed, it can't be out relative to the cam unless someone snapped the key off.........

my old key had snapped on the old camwheel, but we replaced it so this is not the issue.
also, we checked the key earlier and its all intact, so that couldnt have moved.



tried timing the car up about 12 times now, both tdc marks lined up perfectly, yet whenever i try and start the engine it is misfiring and backfiring, like it is out of time?

anyone else had problems like this?

theyre definately lined up in the right places against the marks, im just rather confused now...