Technical Valve Clearance adjustment OHV

[99 Sei]

How do you adjust the valve clearances on an OHV 0.9 seicento without the threaded adjusters or locknuts on the rockers? Are there's shims in the hydraulic tappets?

What are the specifications?

My haynes is for a cinquecento and it says to adjust as with any old OHV using the threaded adjusters. Only my engine doesn't have any on the rockers, just pins that look like they are shrunk or pressed in to the rocker arms.

Cheers

 

[koalar]

Click the link in Post 12

Here

Valve clearance adjustments for 2017 1.2 8v | FIAT 500 (2007+)

Hi, I own a FIAT 500 1.2 (2017) Engine Code 169A4000 / 312AXA1A. According to the service manual the valve clearances need to be checked and if necessary adjusted as part of the service. Can anyone tell me whether the valve clearances require manual adjustment on this engine? If so...

www.fiatforum.com

Translation works fine in my browser

 

[David C]

If you’ve got the pure hydraulic rocker arms, there is no adjustment available. It should all be taken care of by the later larger hydraulic tappets.

 

[David C]

Click the link in Post 12

Here

Valve clearance adjustments for 2017 1.2 8v | FIAT 500 (2007+)

Hi, I own a FIAT 500 1.2 (2017) Engine Code 169A4000 / 312AXA1A. According to the service manual the valve clearances need to be checked and if necessary adjusted as part of the service. Can anyone tell me whether the valve clearances require manual adjustment on this engine? If so...

www.fiatforum.com

Translation works fine in my browser

Wrong engine…

Unless you meant the section at the top where it says there is no adjustment on the 899 OHV engine.

 

[koalar]

Wrong engine…

Oh yer sorry didn’t see the 0.9

 

[99 Sei]

Thanks ,

so what happens with a head skim or valve seat work? do they just compensate accordingly?

cheers

 

[David C]

Thanks ,

so what happens with a head skim or valve seat work? do they just compensate accordingly?

cheers

Yes they should.
The early small tappets were a bit rubbish… never a good sign that they put the adjustment on there too.

My 899 Cinq had the early type and I swapped them out for the pure mechanical rockers from a Panda.
Just mechanical adjustment, no hydraulic. They were quieter and I didn’t need to adjust them over time either…. I expected to need to, but didn’t.

I don’t have any direct experience of the later pure hydraulic rockers though.

 

[99 Sei]

Great, thanks David

 

[Prawny12009]

Check out this video for a before and after tappet replacement see 10:45