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1937 WD 40

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BillD1

08-21-2005 18:07:17

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Hauled it home today Runs on gas and not very long or good on diesel Major suspect is bad diesel and clogged filters Do not have the manuals yet Have heard six filters between tank and injectors Can any one educate me a little? Do not like tearing into something without a clue.

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n9lhm

08-21-2005 18:25:32

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Re: 1937 WD 40 in reply to BillD1, 08-21-2005 18:07:17

Well lets see, the filters are: 1. Screen in fill opening in tank. 2. Screen in filter housing. 3. Sock in filter housing. 4. Screen in front of suction valves in injection pump. 5. Screen in injectors. Oops, somewhere I missed one. :) Like I said, the big filter in the housing is actually two filters. The cloth (sock) filter is spring loaded and when you release it from the holder will suddenly expand to about twice its compressed length. The screen filter is in the inside tube that holds the sock filter compressed. You can probably clean the screen with a toothbrush and solvent. The sock filter you can compress and wash out in solvent. There is also a 1/8" pipe plug on the side of the distributor block on the top of the injection pump that you can screw a pressure gauge into and monitor the charge pump pressure. Spec is around 24 lbs, mine runs OK with about 15, much below that they won"t charge the suction valves. When it"s running on gas or diesel, you can do the usual trick of loosening the flare fittings on the top of the injectors to bleed air and see if you are getting fuel to all cylinders. Stuck suction valves in injection pump will kill individual cylinders. Good luck, write back if you need more help. Brian

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