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O.S. FS-61 Rebuild

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O.S. FS-61 Rebuild

Old 01-30-2016, 09:05 AM
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dirtyed
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Default O.S. FS-61 Rebuild

I am attempting to rebuild a O.S. FS-61 and need some advise. What is the torque specifications for the various fasteners? I have the operator manual and have read/viewed several rebuild posts but there are no references to torque; I can not believe it is not important. Where can I find the spec's I need?
Old 01-31-2016, 01:38 PM
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Gray Beard
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You can go into OS support and ask Bax. I have never seen a torque spec sheet but did get the spec years ago for a small gas engine. I can't recall the torque but it was done in inch pounds and wasn't much. If Bill has the specs please post them here for everyone.
Old 02-01-2016, 08:51 AM
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dirtyed
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Originally Posted by Gray Beard
You can go into OS support and ask Bax. I have never seen a torque spec sheet but did get the spec years ago for a small gas engine. I can't recall the torque but it was done in inch pounds and wasn't much. If Bill has the specs please post them here for everyone.
I have sent a request to O.S. Support and will re-post the reply.
Old 02-02-2016, 06:51 AM
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Originally Posted by dirtyed
I have sent a request to O.S. Support and will re-post the reply.
As I promised, the reply I got from O.S,: " O.S. does not have torque specifications for their engines. We just get the bolts "good and tight" with the hex keys. We tighten but do not allow the key to strip in the bolt." This answers my question; use the Armstrong method.
Old 02-02-2016, 07:23 AM
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Use a weak Armstrong, you are dealing with aluminum.
I just snug them up tight and have not had any problems.
Try and use about the same torque on all of the head bolts.

Good Luck,
KW_Counter
Old 02-02-2016, 08:06 AM
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Gray Beard
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Well, it's been a lot of years sense I have bothered asking that question and got the same answer. I was working in a small engine service repair shop and we got the same answer for chain saws and brush cutters. We finally ended up just doing it by brail then using our own torque wrench and seeing about what we had. That is what we used and it was just to get them all down evenly. I have rebuilt a lot of four stroke model engines over the years and I do have the torque pattern for the OS engines head but no specs. Never had a problem. I also use Never Seize on all the bolts.
I have had the bolts get sticky/tight.

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