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Tractor Talk Discussion Forum

Ford 360 BB

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Matt Weltz

08-23-2007 17:35:36




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I rebuilt a Ford big-block 360 for my aunt in May of this year. It went into her 1974 Ford F100 (4x4, manual). It is her farm truck. The motor was in pretty bad shape and required alot of work. Anyway, ran great until last night. She drove it about 50 miles to work and was on her way home and it started missing and backfiring. We went and picked her up and towed the truck home. Upon inspection, one on the coil wires had come loose and was only connecting part of the time. Started it back up and it ran great for about 5 minutes. Once things started to warm up, the engine started to knock. While watching and listening, noticed that the harmonic balancer was wobbling badly. We checked the bolt and it is still tight on the crankshaft. I am a little stumped. They are not the best at maintaining things and it was below the add mark on the engine oil dipstick. (Not sure how it got that low already) Only thing I can thing is that they got it really hot with too little oil and warped the crankshaft. What do you guys think? I plan on pulling the engine back out tomorrow and would like some other opinions on what to check. Thank you!!!

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RobMD

08-23-2007 21:14:21




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 Re: Ford 360 BB in reply to Matt Weltz, 08-23-2007 17:35:36  
The engine will use oil as it is being broken in. It's only normal for it to do that. After, say, 500 miles, you should see it using less oil.

It also sounds like you need new ignition stuff.



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Matt Weltz

08-23-2007 17:54:45




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 Re: Ford 360 BB in reply to Matt Weltz, 08-23-2007 17:35:36  
As best I can tell, the pulleys bolted to the harmonic balancer are running straight which is what has me stumped. When I took it apart and put it back together, there was not rubber damper that I am aware of, just the crankshaft, the colar over the crankshaft into the timing cover, and the balancer/pulleys. Where should the dampener have been and what did it look like??? Thanks...



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Jon Hagen

08-23-2007 17:48:27




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 Re: Ford 360 BB in reply to Matt Weltz, 08-23-2007 17:35:36  
Does the crankshaft pulley wobble too, or just the damper outer ring ? If the pulley runs straight, the crank is likely OK. The Damper is a two piece affair with an outer ring mounted to the inner hub by a ring of rubber. With age the rubber can rot and allow the outer ring to come loose on the inner hub. The knock may be the loose outer ring striking the crankshaft pulley or timing chain cover. good luck, hope it is a cheap and simple fix .

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Matt Weltz

08-23-2007 17:57:32




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 Re: Ford 360 BB in reply to Jon Hagen, 08-23-2007 17:48:27  
After reading your post again, I think I know what you are saying. The balancer itself is a two piece assembly with a hub, rubber dampener, and then the outer ring with the timing marks. How would I check that??



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Lumpy

08-23-2007 18:15:10




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 Re: Ford 360 BB in reply to Matt Weltz, 08-23-2007 17:57:32  
The only real way to check it is to take it off and look at it. I have had them come off in pieces. As far as low oil and damage to the bearings.... yes it's very possible, but the Ford 360/390 was one of the toughest engines they ever had as far as taking abuse. Personally I think they were the best pickup engine out there. Lots of low end grunt and they would lug forever. This is coming from a chevy guy!

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Jon Hagen

08-23-2007 18:28:15




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 Re: Ford 360 BB in reply to Lumpy, 08-23-2007 18:15:10  
Thats it Matt, the Damper/balancer assy is a cast iron hub with a thin layer(aprox 1/8-1/4 inch) of rubber bonding it to the outer cast iron ring with the timing marks on it. Examine that thin gap of rubber between the inner hub and outer ring to see if the rubber is falling apart. also use a timing light on the running engine to see if the timing marks are way off because the outer ring is no longer held in correct reference to the inner hub. It is very likely that the backfiring and banging has shaken a tired old damper/balancer apart.

When you remove a Damper/balancer from an engine, use only a damper puller which pulls only on the pulley bolt holes, never a conventional jaw type puller hooked to the outer ring. Pulling on the outer ring will destroy the rubber part that bonds the inner and outer damper/balancer parts together.

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