Hate to ask this
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Tuned
Joined: Dec 2017
Posts: 353
Likes: 6
From: Arkansas
Hate to ask this
1951 239, had battery checked and it was bad so replaced it. Now when I hit the starter button the fan turns but I do not hear the pistons going up and down. I checked the compression and get zero! If the fan turns that tells me that the crankshaft is indeed turning. What do you folks think, timing chain or gear broke? Any suggestions would be extremely helpful.
Logistics Pro
Joined: Jul 2016
Posts: 3,650
Likes: 816
From: Swan River Valley M.B Can
Did this truck run before ? The starter turns the crankshaft which is connected to your rods and pistons so if its turning the pistons are moving . Battery hooked up backwards ? I'm not familiar with those starters as most wouldn't work backwards .
Cargo Master
Joined: Feb 2008
Posts: 2,795
Likes: 129
From: Windermere Valley,B.C. Ca
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Tuned
Joined: Dec 2017
Posts: 353
Likes: 6
From: Arkansas
The battery is hooked up to negative ground,( switched the engine to 12 V), the engine has run well in the past
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Logistics Pro
Joined: Sep 2014
Posts: 4,920
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From: Bothell & Silverdale, WA
Nope. Distributor drives off the front of cam.
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
The distributor won't turn if the timing gear has sheared. That would be the quickest, easiest way to see if that's the problem. The cam gear is phenolic and after 60+ yrs they do fail.
You should remove ALL the spark plugs for a compression test, but it isn't going to get you off Zero. If you look thru the spark plug holes with a good light, you can watch the valves move (or not).
You should remove ALL the spark plugs for a compression test, but it isn't going to get you off Zero. If you look thru the spark plug holes with a good light, you can watch the valves move (or not).