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Restoration & Repair Tips Board

headgasket

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jimrump

09-30-2004 19:20:06




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hi - question , i have a jb 51b i am wanting to redo what i believe is a blown headgasket. this will be my 1st headgasket...question is approx how long can i expect it to take, (roughly) and considering i have never done this before any opinions would be appreciated. also after completion of the repairs ,should the crank case be flushed if so with what please ... thanks in advance




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Weirsdale George

10-01-2004 06:22:17




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 Re: headgasket in reply to jimrump, 09-30-2004 19:20:06  
It is going to take as long as it takes. There is no way of determining this without knowing your mechanical ability, tools available, etc. A guy who knows what he is doing could do it in an easy day with a very long lunch break if the parts are at hand, exclusive of doing a valve job, replacing the brass sleeves, grinding the head, etc., etc.

Before you do anything, contact a John Deere dealer and order yourself a service manual. Best money you will ever spend.

What makes you think you have a blown head gasket? Low compression on one or both cylinders, coolant leaking into the combustion chamber(s), coolant leaking into the crankcase?

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CRUSADER

10-01-2004 05:54:13




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 Re: headgasket in reply to jimrump, 09-30-2004 19:20:06  
jimrump,
As with any other engines, make sure that the surfaces are very clean. You also need to replace the lead washers that go under the nuts. make sure that the oil line is connected properly and that the valve clearance is set to specs. Since you have the head off, I would check the valves and insure that they are in good condition. Remember that when the engine on those two-cylinders shut down that the exhaust valve on #2 cylinder is usually setting open.

Hope this is of some value to you.
Jim

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