OC46 reassembly

mjsoliver · April 09, 2016, 12:53:10 AM

I'll be picking up the new valves, guides, springs, and gaskets over the weekend. When I start going back together with it, what is the proper head bolt torque and valve lash adjustment? Hercules GO130 gas. TIA!!

oliverchris · April 09, 2016, 01:53:12 AM

Here you go....

oliverchris · April 09, 2016, 02:10:49 AM

Clearance is 0.010 for intake and exhaust

mjsoliver · April 09, 2016, 02:14:29 AM

Thanks Chris!! That's just what I needed!!

Blake Malkamaki · April 09, 2016, 04:03:58 AM

Is that hot or cold Chris?

Quote from: oliverchris on April 09, 2016, 02:10:49 AM
Clearance is 0.010 for intake and exhaust

mjsoliver · April 09, 2016, 01:39:31 PM

That's a good question Blake. I always adjust valves in my wheel tractors cold, so I didn't even think to ask. Thanks for asking!!

Blake Malkamaki · April 09, 2016, 06:12:20 PM

A lot of engines give their clearances as hot. 0.010" just seems a little tight for an overhead valve engine when set cold as you will have lineal expansion of the pushrod. Maybe I am wrong and it is cold, but I just thought one should double check.

mjsoliver · April 11, 2016, 01:28:41 AM

Hey Oliverchris--Is that valve lash hot or cold, and does the rear head bolt (drilled) get torqued to 140 also. I have snapped a drilled one on one of my Oliver wheel tractors once. It wasn't too big a deal as it was a bolt and a long nail fit down in it tight and turned the broken threads out. This one being a stud wouldn't be so simple if it breaks!

oliverchris · April 11, 2016, 07:54:16 PM

0.012 cold — 0.010 hot after final cylinder head bolt torque to 140ft.lbs (that is after engine is brought up to operating temperature, remove rocker assembly again, re-torque, then back to operating temp., then re-check/set valve gap). That drilled stud is same torque according to shop manual.

Blake Malkamaki · April 11, 2016, 07:59:57 PM

Some of Chris' posts are coming up blank to me. Anyone else having that problem? The text is actually there, but not showing up. When I reply with quote it comes up. Below is his post:

Quote from: oliverchris on April 11, 2016, 07:54:16 PM
0.012 cold ï¿½ 0.010 hot after final cylinder head bolt torque

oliverchris · April 11, 2016, 08:01:52 PM

Trying again:
0.012 cold — 0.010 hot after final cylinder head bolt torque to 140ft.lbs (that is after engine is brought up to operating temperature, remove rocker assembly again, re-torque, then back to operating temp., then re-check/set valve gap). That drilled stud is same torque according to shop manual.
« Last Edit: Today at 03:01:07 PM by oliverchris »

Blake Malkamaki · April 11, 2016, 08:04:47 PM

Blank. I can tell it's there, but not showing.

Blake Malkamaki · April 11, 2016, 09:51:01 PM

Yes. This post shows up ok. Your previous one still does not.

Quote from: oliverchris on April 11, 2016, 08:28:58 PM
How weird. I just logged out and in again - any better? Time to clean up the old hard drive, and see what's cookin', I guess

1956oc3 · April 11, 2016, 10:05:03 PM

That's weird, they all show up for me, or am I just special?

Lowspeedlife · April 11, 2016, 10:24:59 PM

All his posts are showing up, down here in Virginia. Good info to have too!