Engine

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xrcr
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Engine

Postby xrcr » Sun Nov 03, 2019 8:25 am

Woo Hoo!!! I got the motor freed up yesterday. 3 weeks or so of tapping, rocking and prying paid off. Tranny fluid and Kroil worked for me.I have a question on the head bolts. The originals are pitted a bit but thinking I get grade 8's that match. Major clean up today and spin the hone.. Going to pop the valves and clean as well. Another question. The head gasket looks good. Instead of buying a new one just yet I'm thinking I'd fire it just to see if it will. Just a quick hit. I intend to replace it for final assembly. Any advice is appreciated
xrcr

inairam
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Re: Engine

Postby inairam » Sun Nov 03, 2019 8:45 am

I have used grade 9 bolts in the head. You will have to grind to length. Put a chaser or a nut on first to clean the threads after grinding. Also chase the threads int he block. You also need some thread seal.

I personally would not try to start it until you are ready. I would see it as too much work. here is a post on my last head off viewtopic.php?f=1&t=93111
When you only have 9 horsepower you need to know the names of all of the ponies!

Jim Reid
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Re: Engine

Postby Jim Reid » Sun Nov 03, 2019 8:58 am

I was rebuilding an engine and talked with a longtime friend and mechanic who worked on a lot of different engines he said grade 8 bolts were to hard and would break they were not designed to stretch like orginal head bolts.

inairam
5+ Years
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Posts: 2287
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
1975 with woods 42-6 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: Engine

Postby inairam » Sun Nov 03, 2019 10:00 am

The loads on the cub are low compaired to modern engines. I use high grade bolts to reduce the chance breaking the puting them in or taking out compaired to the about grade 5 bolts orginally used.
When you only have 9 horsepower you need to know the names of all of the ponies!

Bob McCarty
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Re: Engine

Postby Bob McCarty » Sun Nov 03, 2019 12:14 pm

inairam wrote: You will have to grind to length.

Or use a thick washer of the same grade to take up the difference.
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we need to think differently."
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BillBolt
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Re: Engine

Postby BillBolt » Sun Nov 03, 2019 11:02 pm

I just cleaned my head boots and reused them. My head gasket looked good. I put a little grease on it. Works for me. My cub sat for 25 years and I wanted to see what shape the engine was in and 2 years later same gasket , head bolts , runs good , no leaks.

outdoors4evr
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Re: Engine

Postby outdoors4evr » Mon Nov 04, 2019 6:51 am

If grade 5 worked for 60 + years. I see no reason to buy anything harder.
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Re: Engine

Postby Gary Dotson » Mon Nov 04, 2019 7:35 am

The specified bolt tightening torque, for the Cub, is beyond the rated capacity of grade 5 bolts, grade 8 is marginal, hence the grade 9 bolts that many are using. I think it's the correct call.

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Stanton
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Re: Engine

Postby Stanton » Mon Nov 04, 2019 8:02 am

xrcr wrote:Woo Hoo!!! I got the motor freed up yesterday. 3 weeks or so of tapping, rocking and prying paid off. Tranny fluid and Kroil worked for me.I have a question on the head bolts. The originals are pitted a bit but thinking I get grade 8's that match. Major clean up today and spin the hone.. Going to pop the valves and clean as well. Another question. The head gasket looks good. Instead of buying a new one just yet I'm thinking I'd fire it just to see if it will. Just a quick hit. I intend to replace it for final assembly. Any advice is appreciated
xrcr


Here's a reference thread from Bob McCarty pertaining to the extra thick washers, if you want to go that route: http://www.farmallcub.com/phpBB2/viewtopic.php?f=1&t=95763&p=754282&hilit=manifold+washer#p754143.

Glad to hear your success. I've found a 50/50 mix of acetone and ATF is the best penetrant. Definitely replace the headbolts with grade 8 and coat the threads. Here's a great reference post by Glen on what to use: http://farmallcub.com/phpBB2/viewtopic.php?f=1&t=102322&start=45#p818355.

IMO, it probably won't hurt a thing to re-use the head gasket just to see if the engine runs. Coat it good with Copper Coat spray.
Stanton
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xrcr
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Tractors Owned: 1950 Cub
1957 Farmall 400
1973 Farmall IH544

Re: Engine

Postby xrcr » Mon Nov 04, 2019 9:31 am

Thanks for all the replies. Seems to be a little bit of variance in the head bolt debate. I'm leaning towards using the originals. Another question is how do you get the valve spring keepers off without losing them. It's upside down from what I'm used too. I've got some ideas but thought I would float the question to the experts

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Re: Engine

Postby Slim140 » Mon Nov 04, 2019 9:37 am

I reused my original head bolts when I rebuilt the '47. Had one stretch and almost break. Went ahead and put grade 9's in it.
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Re: Engine

Postby Waif » Mon Nov 04, 2019 10:37 am

Shane N. wrote:I reused my original head bolts when I rebuilt the '47. Had one stretch and almost break. Went ahead and put grade 9's in it.



Your example is a good argument for new bolts.
More so if original specs are used/desired.
Some other engines demand new head bolts when old or original ones are removed.

Original Cub engineers had their reasons. I don't know if they wanted a bolt to give some movement before a head stressed...Or if it was a matter of economy.
Given the robust nature of a Cub , the economy angle is not as strong. (?)

FIRSTCUB
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Re: Engine

Postby FIRSTCUB » Mon Nov 04, 2019 12:35 pm

Awesome news....send some of that luck my way !! :)):

xrcr
Cub Star
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Tractors Owned: 1950 Cub
1957 Farmall 400
1973 Farmall IH544

Re: Engine

Postby xrcr » Mon Nov 04, 2019 12:56 pm

Patience is key First Cub. I get it's tough. My patience stems from being a tightwad and a mess of grandkids. You will get it

xrcr
Cub Star
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Posts: 53
Joined: Tue Aug 06, 2019 12:45 pm
Zip Code: 63348
Tractors Owned: 1950 Cub
1957 Farmall 400
1973 Farmall IH544

Re: Engine

Postby xrcr » Mon Nov 04, 2019 12:58 pm

Shane N. That pic convinced me to spend the money. Where did you get your new bolts? Alot of questionable stuff on the interweb


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