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Turning engine by hand
#1214601 Tue Apr 25 2017 04:02 AM
Joined: Oct 2009
Posts: 161
J
jremig Offline OP
Shop Shark
Ok, scenario...what is the best way to turn a motor over by hand? 235 motor with an 848 head. Hoping to use this motor for my 52, 3100. Motor is complete, all parts still attached except for valve cover which I removed. Is there a place to latch on to the crank for turning over the engine? A place to insert a bolt to put a wrench on? Or should I be able to grab the crank pully and turn it by hand?

Thanks
Joe

Re: Turning engine by hand
jremig #1214602 Tue Apr 25 2017 04:09 AM
Joined: Feb 2004
Posts: 20,358
H
Boltergeist
Screw two 3/8-16 bolts into the harmonic balancer, into the puller attaching holes and use a pry bar between them. A better way is to use the chisel-shaped end of a shepherd's crook wrecking bar between the flywheel ring gear teeth and the edge of the bellhousing.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Turning engine by hand
jremig #1214630 Tue Apr 25 2017 01:35 PM
Joined: Aug 2005
Posts: 9,002
Master Gabster
Make sure you don't have spark plugs in it.


Save a life, adopt a senior shelter pet.
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Re: Turning engine by hand
jremig #1214640 Tue Apr 25 2017 02:23 PM
Joined: Oct 2009
Posts: 161
J
jremig Offline OP
Shop Shark
Plugs are out and sitting on the work bench. Will try some grade 8 bolts on the balancer and see if I can't get it to turn

Re: Turning engine by hand
jremig #1214697 Tue Apr 25 2017 07:47 PM
Joined: Jul 2010
Posts: 619
M
Shop Shark
Jerry's technique works great. I also have good luck using a flywheel turning tool if the engine isn't seized up. It's a tool that does what Jerry describes with the wrecking bar, but it locks itself into the flywheel instead of having to use the bellhousing for leverage. If you search 'flywheel turning tool' on eBay, you'll get several hits.

If you have the engine out, consider using one of Jerry's kits to tap the crank snout so that you can install the harmonic balancer with a bolt. Sure makes it easier to turn over the engine using the bolt.

Matt

Re: Turning engine by hand
jremig #1214703 Tue Apr 25 2017 08:03 PM
Joined: Sep 2001
Posts: 30,010
ace skiver
Jerry,

Do you recommend using the 216/235/261 crank-snout bolt to turn the engine through a full rotation?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Turning engine by hand
jremig #1214830 Wed Apr 26 2017 04:49 PM
Joined: Feb 2004
Posts: 20,358
H
Boltergeist
If it's one that's seized or hasn't been run in a while, NO! You will either strip the thread or break the bolt on a seized-up engine. If it's free to turn, no problem. The 7/16-20 bolt can take 70-75 ft/lbs of torque without a problem, which is much more than a running engine needs.

Some balancers have a squared-off hole in the front that will accept a 3/4" square drive socket extension. If so, that's the best way to turn the crank, using a 3/4 drive ratchet or a breaker bar.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Turning engine by hand
jremig #1214963 Thu Apr 27 2017 03:45 PM
Joined: Oct 2016
Posts: 519
W
Shop Shark
I just took off the flywheel protective cover underneath and grabbed the flywheel by hand (with shop gloves on) and it turns really easily, even with spark plugs in.


1950 SUBURBAN / SCHOOL BUS A.K.A "THE SCHOOL RUST"

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