| Author |
 Topic Search  Topic Options
|
Tom Elder 
Silver Level
Joined: 06 Dec 2016
Location: Ky.
Points: 58
|
 Post Options
 Thanks(0)
 Quote  Reply
 Topic: Main bearing foot lbs,on a B
Posted: 17 Jan 2017 at 11:50am |
|
I am in the middle of overhauling one of my 2 Bs
I had it line bored ,rods conditioned, sleeves installed etc. at the machine shop.My auto mechanic of 30 years put the crank and rods in it yesterday.The machine shop advised him to only torque the main bolts to 50 instead of 80 ,because the were grade 5 not grade 8, .Is this a bad or good move?
Thanks ahead of time,Tom
|
|
2 1949bs,one with belly mower one with side sickle bar
|
 |
|
Sponsored Links
|
|
|
steve(ill)
Orange Level Access
Joined: 11 Sep 2009
Location: illinois
Points: 86391
|
Post Options
Thanks(0)
Quote Reply
Posted: 17 Jan 2017 at 12:10pm |
|
why were they changed to grade 5 ? SPEC is 80 ft pounds on factory bolts
|
|
Like them all, but love the "B"s.
|
|
Tom Elder
Silver Level
Joined: 06 Dec 2016
Location: Ky.
Points: 58
|
Post Options
Thanks(0)
Quote Reply
Posted: 17 Jan 2017 at 12:17pm |
|
they are what was in it.with holes for safety wire ,i just figured the machine shop could tell by the head markings or something,along those lines,thanks
|
|
2 1949bs,one with belly mower one with side sickle bar
|
|
Allis dave
Orange Level
Joined: 10 May 2012
Location: Northern IN
Points: 3009
|
Post Options
Thanks(0)
Quote Reply
Posted: 17 Jan 2017 at 12:22pm |
|
3 head marking means grade 5. The stock head bolts on my WD45 are grade 5's but they are torqued to 90lbs. Seems high for a grade 5 1/2 bolts but that's what the book says. I would do what the manual says. Someone might chime in and confirm that they had grade 5 from the factory. I bet they did.
|
|
Brian Jasper co. Ia
Orange Level
Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
|
Post Options
Thanks(0)
Quote Reply
Posted: 17 Jan 2017 at 3:50pm |
|
I'd follow the shop manual. I ran into a similar situation when I overhauled my 262. Without looking IIRC the head bolt torque is something like 120 ft lbs on 1/2" bolts. Nominal torque on a grade 8 1/2" bolt is like 80 or 90, somewhere in that area. Original A-C bolts are higher. Whatever is in the manual is what the factory did...
|
|
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
|
|
steve(ill)
Orange Level Access
Joined: 11 Sep 2009
Location: illinois
Points: 86391
|
Post Options
Thanks(0)
Quote Reply
Posted: 17 Jan 2017 at 8:45pm |
Im not sure all the bolts in 1940 were marked on the heads. Here is a photo that DICK posted a couple days ago.
|
|
Like them all, but love the "B"s.
|
|
Tom Elder
Silver Level
Joined: 06 Dec 2016
Location: Ky.
Points: 58
|
Post Options
Thanks(0)
Quote Reply
Posted: 17 Jan 2017 at 9:01pm |
|
thanks bunches men
|
|
2 1949bs,one with belly mower one with side sickle bar
|
|
