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John Deere Tractors Discussion Forum

1949 A Cylinder coolant leak

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jchantry

12-08-2006 20:10:57

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1949 JD A S/N 634827 in North GA

Looking for some ideas.

Recently found some coolant in #1 cylinder, so suspected blown head gasket.

Pulled head, head gasket looked fairly good - no cracks or missing gasket material (what I have seen before in a car engine blown head gasket).

Visually inspected cylinder head and block for cracks - none found.

Hate to reassmble engine without finding source of leak.

Any ideas on how to test for the leak?

Note: Worked fine up till this, had antifreeze, coolant did not freeze.

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Ken Thies

12-09-2006 13:05:14

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Re: 1949 A Cylinder coolant leak in reply to jchantry, 12-08-2006 20:10:57

Check the pushrod tubes in the head.

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Jim Broughton

12-08-2006 20:29:43

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Re: 1949 A Cylinder coolant leak in reply to jchantry, 12-08-2006 20:10:57

Check your cooling tubes !! Best of luck, those old "A"s are tough !! Jim B.

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jchantry

12-08-2006 20:56:11

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Re: 1949 A Cylinder coolant leak in reply to Jim Broughton, 12-08-2006 20:29:43

Forgot to mention, it has a powerblock 6"-2.

I could not see any cooling tubes, could you explain, or does a powerblock not have them?

Also, Where can I get rings for this engine since it has 6" pistons?

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Drew

12-08-2006 21:48:02

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Re: 1949 A Cylinder coolant leak in reply to jchantry, 12-08-2006 20:56:11

The power block has o-rings at the top and bottom of each sleeve. It is possible that one of these o-rings is leaking coolant.

Hastings will probably have rings to fit the power block pistons. BUT, just about every power block piston I have seen has ring lands that are pretty much shot. If the ring lands are shot, new rings arent going to help much.

Im guessing the cooling tubes that Jim mentions are pushrod tubes, which the model A does not have.

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