tourqe specs
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taber hodaka
- Posts: 2240
- Joined: Mon Jul 29, 2013 6:34 pm
Re: tourqe specs
Personally I would not trust a leak down test on a engine that has sat around for years I would redo the seals and check the bearings. I do hand lap the head and grease the base gasket. I am sure that I have done 100+ engines and with proper jetting and quality oil I just have not had problems I have never done a leak down test. I do recommend to everyone that you follow the leaders of the pack Danny & Ed and others. Jack I also agree with you on the Teflon tape, And Danny I don't see how the head bolt could leak at the case if the hole isn't drilled into the interior.?? The headbolts are a tight fit and hard to remove, I am only talking 100cc here.---------Clarence
Re: tourqe specs
Hydraulic Jack,
Perfection is a goal desired but not always achieved. I have found it almost impossible to get a "perfect" seal at the spark plug threads. New plug, new plug seal washer, tighten plug, etc. The leak is very small but still there. Maybe a little anti-sieze applied to the threads might help. With Teflon tape I can concentrate on the fixable items. We are talking a very very small leak here. Other wise repairs are required.
tabor hodaka, I can only report what I find. Seal cylinder studs and no leaks from that source....maybe case is porous. I can believe with careful assembly and no air leak tests that you can achieve workable results. If the leaks are small they could be compensated for with jetting. I would suspect that air leak testing was not performed at the factory. Also have to wonder how a small leak maybe self sealing. That being, as the engine heats up and expands small leaks are sealed. Metal expansion would not of course apply to rubber seal leaks. Also a perfectly air tight engine is not the standard... although desired. A small loss of pressure over a couple minutes time I think is acceptable. That would explain your ability to carefully assemble engines with out air leak testing that worked acceptably.
By testing and finding the common leaks, I can assemble the engine as described with greater assurance of having it pass a leak down test the first time.
Danny Cooke
Perfection is a goal desired but not always achieved. I have found it almost impossible to get a "perfect" seal at the spark plug threads. New plug, new plug seal washer, tighten plug, etc. The leak is very small but still there. Maybe a little anti-sieze applied to the threads might help. With Teflon tape I can concentrate on the fixable items. We are talking a very very small leak here. Other wise repairs are required.
tabor hodaka, I can only report what I find. Seal cylinder studs and no leaks from that source....maybe case is porous. I can believe with careful assembly and no air leak tests that you can achieve workable results. If the leaks are small they could be compensated for with jetting. I would suspect that air leak testing was not performed at the factory. Also have to wonder how a small leak maybe self sealing. That being, as the engine heats up and expands small leaks are sealed. Metal expansion would not of course apply to rubber seal leaks. Also a perfectly air tight engine is not the standard... although desired. A small loss of pressure over a couple minutes time I think is acceptable. That would explain your ability to carefully assemble engines with out air leak testing that worked acceptably.
By testing and finding the common leaks, I can assemble the engine as described with greater assurance of having it pass a leak down test the first time.
Danny Cooke
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