Technical Valve clearances and the like (again probably)

[Tinyotim]

Trying to set valve clearances, how do I identify which is exhaust and which is inlet?
Thanks

 

[JumpJet]

Exhaust valves are the outermost two - adjacent to the exhaust ports. Intake valves are the innermost - adjacent to the intake port. #1 cylinder is the aft-most, #2 is forward.

 

[Toshi 975]

Well if you think about it the inlet is served by a single carburettor positioned centrally on the cylinder head whilst there are two exhaust outlets located front and back of the head so the two inner valves are the inlet valves and the outer ones serve the exhaust. Sounds like you might be working without any sort of manual so another tip is think of the valves as numbered 1 to 4 from front to back. Then apply the rule of five. When rocker no 1 is fully depressed you adjust number 4, no 2 depressed adjust no 3 and so on.

 

[Tinyotim]

Wow thanks for quick replies ,
I’m reading the manual as posted on this site but for some reason I couldn’t find the info.
Been a while since I’ve tinkered with air cooled ?

 

[Tinyotim]

Well if you think about it the inlet is served by a single carburettor positioned centrally on the cylinder head whilst there are two exhaust outlets located front and back of the head so the two inner valves are the inlet valves and the outer ones serve the exhaust. Sounds like you might be working without any sort of manual so another tip is think of the valves as numbered 1 to 4 from front to back. Then apply the rule of five. When rocker no 1 is fully depressed you adjust number 4, no 2 depressed adjust no 3 and so on.

Jut a thought, front to back of the car or front to back as I look at the motor ?

 

[Toshi 975]

Jut a thought, front to back of the car or front to back as I look at the motor ?

That does not matter

 

[the hobbler]

Technically, the 'front' of the 500 engine is at the rear of the car---front being where the timing-chain cover is. Set the tappets COLD (8 thou IN and 10 thou OUT). Don't worry that you haven't tinkered with an air-cooled enginefor some time---the only difference between an air-cooled and a water-cooled engine is the cooling medium.

 

[fiat500]

is your engine the 110 or the 126 version?

The original 499 engine has the same clearances on both inlet and exhaust. These are usually given and measured in metric and are 0.15 mm.

The later versions of the engine from the 126 are 0.20mm (inlet) and and 0.25mm (exhaust).

https://webshop.fiat500126.com/en/sites/47