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Base gasket leaking back cylinder - Harley Davidson Motorcycles

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Hi Anonymous, replace it. Good luck

Posted on May 08, 2015


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SOURCE: 2000 x-1 millenium : leaking base gasket cam

Go to Haynes website and look for your bike model

Posted on Mar 15, 2010

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SOURCE: Hi, I have a 1993 HD Heritage Softail with a

no it cant it has to be replaced.

Posted on Feb 17, 2011

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SOURCE: is it a concern an oil leak from the base rear cylinder 1995 heritage softail

You can ride it, but the leaking oil could cause problems if it gets on the rear tire, brakes, etc. You may as well replace both base gaskets at the same time.

Posted on Mar 06, 2013

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Rocker Cover leak

The fasteners should be checked for correct torque/retorqued every 5k miles. At this mileage you shouldn't have leakage if this maintenance was done, so it likely was not. Start by doing the maint. here is the tech bulletin with instructions: TM1132 . There are gaskets/o-rings, also at the cylinder bases. If your performance is fine and retorquiing doesn't take care of leakage, just do the top end gasketing, not the cylinders. It is not difficult but you will need a tech manual.

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I have water leaking into the gear box is it the o rings (4) ? The bike is a 2000 250 sx

Is the oil in your engine emulsified? (creamy substance in the oil or around the oil filler) If so then it would seem as if you may have a leaking head gasket, or cylinder base gasket.

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Will not start easily and stay running

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Is it a concern an oil leak from the base rear cylinder 1995 heritage softail

You can ride it, but the leaking oil could cause problems if it gets on the rear tire, brakes, etc. You may as well replace both base gaskets at the same time.

Mar 05, 2013 | Harley Davidson FLSTC Heritage Softail...

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Why does front cyl. base gasket keep blowing out on 1984 sportster with stroker kit?

It's unusual for an Ironhead Sportster to blow a base gasket. The reason is that the cylinder bolts directly to the crankcase via four short studs. I would suspect either a warped cylinder base or case. Now, the Evolution Sporty's are bad about base leaks.

Good Luck

May 09, 2011 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

I have a 88 xlh 1200. the problem is fuel and air blowing back out of the carb. when engine temp is cooler it runs excellent but when it warms up it turns into a dog and the front cylinder pings. the front...

Since you've got the heads off, you've got to pull the cylinders and replace the base gasket. If you don't, since you removed the torque on them, they'll leak like crazy. Another thing you need to do is replace the studs. You have the "old style" studs that stretch and cause the base gasket leaks and blown head gaskets. Replace the studs with the new upgraded ones or Colony Machine studs. Make sure your pistons are at least 0.005" oversize from what the bore is now. Hone the cylinders to fit with the torques plates on the cylinders. Go ahead and spring for a valve job, it don't cost that much to have the valves reseated.

You earlier problem was probably an intake manifold leak. The pinging on the front cylinder is the give away. This indicates you had a lean mixture condition in the front cylinder. This typical to a degree but not to the point of pinging.

Good Luck

Oct 26, 2010 | Harley Davidson XL 1200 C Sportster Custom...

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Hi, i got a hitachi nv45ab and My nailer leaks air out the back

Hitachi nv45 series is the most popular line of nailers amoung professional roofers. There are three areas that develop leakes. Leak out head vent indicates cylinder stuck in lower position or headvalve worn. With air connected, gently rap head of gun against rubber mat to move cylinder to position. (Use caution not to damage head). If this action works, gun needs cleaning internally or lack of oil. If air still leaks out vent remove head and examine valve in head and replace as needed. Check that cylinder moves freely up/down (travel aprox 1/4"). If cylinder is hard to move pull cylinder and clean replacing orings as needed. If leaking around trigger, remove rollpin and trigger and check nylon ball for pits and replace as needed. If leaking around base of gun check for loose bolts and/or worn gaskets. Remove nail canaster to check feed piston gasket and screws. Good luck with your repair and post again if you have other question.

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1 Answer

Inner primary leak, base gasket leak.

Simply, the rocker box and cylinder will have to come off to replace the cylinder base gasket. And the out and inner primary will have to come off to replace the gasket. Of course all the stuff attached to the cylinder and the primaries will have to come off too. Not to mention the primary chain, clutch assembly and compensator sproket inside the primart case. It's a minor/major job in a shop.

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How to repair main gasket on a 1990 electra glide

I assume that by "main jug gasket" you are talking about the cylinder base gasket. If so, to fix the leak you must pull the cylinder off to get to the gasket. This is a common problem with the Evolution engine.

This job will require that the fuel tank be removed. The rocker boxes, the head, and cylinder will have to be removed from the engine. To get the heads off, the exhaust system and induction system will have to come off as well. The old gaskets will have to be replace with new ones. One other thing that will have to be replaced is the cylinder studs. There are four studs on each cylinder. Due to the problems that Harley experienced with the leakage at the cylinder bases, they came out with a new set of studs that were designed to help with this situation. You will want to replace these studs as well and a new set of rings while you're there.

This is not an extremely difficult job but it is quite involved, much too involved for me to give you all the instructions via this forum. I would advise you to purchase a H-D service manual for your bike. There are also some special tools involved in doing this job. You must have an "inch pound" and a "foot pound" torque wrench to do the job properly. You'll also need a ring compressor and a cylinder hone.

Good Luck, Steve

Apr 25, 2010 | Harley Davidson FLHTC - FLHTCI Electra...

1 Answer



  1. Disconnect the fuel hoses from the fuel pump.
  2. Remove the two mounting bolts, the fuel pump and the base insulator.
    1. Scrape any old gasket material from the cylinder head.

    1. Install new base gasket with suitable gasket sealer applied to both sides.
    2. Install fuel pump with base insulator using the two mounting bolts. Ensure that the fuel pump lever is properly aligned with the camshaft lobe.
    3. Connect fuel hoses to their proper nipples.
    4. Start engine and check for fuel leaks.

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