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Username Post: locked up block        (Topic#360136)
995jim 
Contributor
Posts: 533
995jim
Loc: Ohio
Reg: 12-17-06
03-12-20 12:09 PM - Post#2788505    

I have an 348 engine block fully assembled except intake that wont turn by hand. I don't plan on rebuilding it but thought if I could fill the cylinders and douse cam under the intake manifold I may be able to loosen it. Not sure what a good product would be, (diesel,kerosene,5-30 motor oil ?). I didn't want to make an investment just to experiment with freeing it up. If it doesn't work Im not worried but thought its worth a try. No water in oil pan, but the pan is empty.
thanks jim

Jim

65' Impala SS, 65' Belair, 89' Silverado Z71, 95' Silverado Z71, 12' Silverado, 15' Silverado LTZ, 16' Tahoe LTZ


 




paulo57509 
Senior Member
Posts: 449

Loc: Tracy, CA
Reg: 07-18-00
03-12-20 03:51 PM - Post#2788519    
    In response to 995jim

Last time I freed up a frozen engine I used ATF on top of the pistons. Replenished regularly and let it soak for about 60 days. Then I hit the tops of the pistons with a 2x4 and mallet.

It was a Model A engine with the head removed.

1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17509
grumpyvette
Age: 72
Loc: FLORIDA USA
Reg: 03-16-01
03-12-20 04:50 PM - Post#2788525    
    In response to paulo57509

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 03-12-20 05:42 PM. Reason for edit: No reason given.

 
1983G20Van 
Super Senior Member
Posts: 3819

Loc: Bedford, Texas, USA
Reg: 11-13-02
03-12-20 08:40 PM - Post#2788537    
    In response to grumpyvette

I use ATF and Acetone myself.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
995jim 
Contributor
Posts: 533
995jim
Loc: Ohio
Reg: 12-17-06
03-13-20 05:43 AM - Post#2788545    
    In response to 1983G20Van

thank you for the information giving me a path forward. As always a great site to come to.
jim

Jim

65' Impala SS, 65' Belair, 89' Silverado Z71, 95' Silverado Z71, 12' Silverado, 15' Silverado LTZ, 16' Tahoe LTZ


 
1carguy 
Newbie
Posts: 39

Reg: 11-30-08
04-06-20 01:22 PM - Post#2790502    
    In response to 995jim

I once freed up a frozen up boat motor by removing plugs and soaking the combustion chambers with Marvels Mistery Oil and letting it soak a day or so. Motor freed up and ran fine until I sold it a couple of years later. That stuff really worked for seized up rings.



 
Am4wag 
Contributor
Posts: 117

Reg: 11-19-15
04-06-20 04:58 PM - Post#2790515    
    In response to 1carguy

I freed up a pair of 903 Cummins in a Chris Craft that sat for 11 years.Marvel Mystery Oil through the air dams.Got them both running in a little over a week.Ran down Alabama rivers from Port Birmingham to Pennsecola Fla.

The bearer of gossip is a small untrustworthy person who takes delight in someone else's problems. Avoid them.
Let's all make the day count. - Charlie Daniels


 




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