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Home made gaskets

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Scrub

06-10-2004 00:03:58

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I have a ford 3000. The hydraulic pump is externally mounted. It is leaking MOTOR oil. I have put gaskets on it 3 times. I clean it very good every time. I have tried it with out sealer, with indian head sealer and with RTV but it still leaks every time. I was gonna make one out of rubber but an old car buff at work said to used shelacked-cardboard, any one ever tried this? Any suggestions appreiciated thanks

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06-10-2004 08:38:50

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Re: Home made gaskets in reply to Scrub, 06-10-2004 00:03:58

I have really good luck on imperfect fits by suing a silicone stuff callRight Stuff by permetex. It comes in a can looks like cheese wiz
Works really good for me.
Just another ideaer

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Mark

06-10-2004 07:26:56

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Re: Home made gaskets in reply to Scrub, 06-10-2004 00:03:58

I recently had a leak on my Bobcat at a hydraulic fitting that defied all logic. New O-ring and gasket seal, the thing still leaked. The guy at my local hydraulic shop told me that sometimes their are cracks so small you will never find them. Trouble is hydraulic fluid always knows how to find those cracks. I replaced the whole fitting and it was fine.
So sometimes replacement is the only solution.

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T_Bone

06-10-2004 04:42:11

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Re: Home made gaskets in reply to Scrub, 06-10-2004 00:03:58

Hi Scrub,

I don't put anything together without Permatex RTV Red or Copper as there rated for continious emmersion in oil or gas. Other colors are not rated for this use.

I run a light bead dead center of the flange then let skin, about 15min, then assymble. I haven't had a leak in 25yrs using this method.

As the other guys noted, check for a mating surface problem.

Motor oil is used as hydraulic oil alot here in AZ where it gets so dang hot. Several of the old repair manuals state that is correct procedure.

The real problem is the system doesn't have a hydraulic oil cooler or a large enough cooler/sump capicity to compensate for the extra cooling thats required and/or has componets that are worn out.

T_Bone

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Ron

06-10-2004 03:41:51

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Re: Home made gaskets in reply to Scrub, 06-10-2004 00:03:58

Take it apart and check the mating surfaces carefully with a steel straightedge. Most likely one is warped/nicked and you'll see light under the steel. There is no gasket that can seal under those conditions.

Once you have the offending parts machined flat, use the correct gasket per the service manual (it does make a difference) and use the proper sealer but only if the service manaul recommends sealer. Some gasket type DO NOT require it. If they specify a specific sealer, use it. If not, I use Permatex #2 non-hardending sealer. It's good up to 4,000 psi. and recommended for hydraulic systems.

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06-10-2004 15:14:03

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Re: Re: Home made gaskets in reply to Ron, 06-10-2004 03:41:51

Ron-- you beat me to it. My suggestions exactly. I have fixed many leaks caused by this condition. Many leaks are caused by improper cleaning of the mating surfaces also. I always scrape and sand-paper all surfaces. I never use a gasket sealer unless the manufacturer recommends it or to hold the gasket in position.

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david val

06-10-2004 01:11:36

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Re: Home made gaskets in reply to Scrub, 06-10-2004 00:03:58

if it's the pump that is driven by the camshaft at the rear of the engine, then gasket thickness is of importance beacause of the meshing gears. you have to check carefully the mating surfaces for iregularities and straightness. if surfaces are straight the best solution may be a tin gasket (cut from a spray can or oil can etc.) a material like 'loctite plastic gasket' applied to both sides and prefarably 'f' grade bolts tightened to their proper torque. make sure your tin thickness is closed to the original gasket thicness.
if the pump sealing surface is not straight (due to tihgtening with a soft thick gasket or a too thin gasket), you can try the tin and plastic gasket. if that dosen;t help, then it should be machined or replaced. david

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