Confirm rocker arm torque spec?

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lobanz
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Confirm rocker arm torque spec?

Postby lobanz » Mon Jul 28, 2014 12:12 pm

Service Manual says 40 ft-lbs. Confirmed with Hoye. But this seems a little high for these small studs (http://www.hoyetractor.com/PROD/search/105225-11350.htm). Stripped two already. Is 40 ft-lbs correct? From what I see, M8's are in the 18 ft-lb range.

I have a 1610D (3T75U engine).
--- Lobanz
[Yanmar 1610D w/FEL]

winston
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Re: Confirm rocker arm torque spec?

Postby winston » Mon Jul 28, 2014 1:54 pm

I was thinking the large threads are 10mm. Interesting though, page 20-00-2 in the 220/226 manual listing specs show "rocker arm shaft support nuts - 40 ft lbs.

Page 20-05-5 (same manual) showing assembly of rocker arm shaft states 27 ft lbs.

Page 20-05-13 (same manual) showing installation of cylinder head states "Tighten rocker arm support nuts to 40 ft lbs.

There is also a generic torque chart in this manual showing 40 ft lbs should be fine for a 10mm grade 7 bolt.

I know this is confusing and there has to be a mistake somewhere. If they are indeed 10mm I would go with the 40 ft lbs.

lobanz
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Re: Confirm rocker arm torque spec?

Postby lobanz » Mon Jul 28, 2014 2:12 pm

winston wrote:[...] I know this is confusing and there has to be a mistake somewhere. If they are indeed 10mm I would go with the 40 ft lbs.


Great. Thanks!
--- Lobanz
[Yanmar 1610D w/FEL]

jonokimber
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Re: Confirm rocker arm torque spec?

Postby jonokimber » Fri Jun 26, 2020 9:58 am

Hi Winston and Lobanz

I just stripped the three original rocker arm nuts on my 1610 engine going for 54 N.m which is 40 ft.lbs

QUESTION - Did you ever find a torque value that didn't strip the nuts?
QUESTION - What grade are these nuts, i just can't make it out?
QUESTION - I can't seem to find M10 x 1.25 6mm thick nuts anywhere, any ideas?

IMG_1625.JPG
IMG_1625.JPG (105.03 KiB) Viewed 349 times


Many thanks.

Jono


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