JAX vintage valve components About 4 years ago I bought a set of adj. lifters made by JAX Vintage Valve Components. My flathead (built by Mark Kirby RIP) has been reliable for 25 years but me being me decided to upgrade the cam and lifters this year. I also purchased a Sneider Cam with these JAX lifters. They were beautifully built and finished.
I installed them paying particular attention to using quality cam breaking lube on the new cam and lifters. I broke in everything over a period of 30 minutes holding 2000 RPM, varying the RPM occasionally. Checked the valve clearances and all was good, After about 1000 miles my engine started making nasty valve noises. I checked the clearance and they were extremely loose. I checked the valve lift and all was in spec. so all I can conclude from this is the adjusters were not working as intended. Has anyone had similar experience with this make of lifter?? Is there anyway I can tighten up the adj. screws without removing them?? |
Re: JAX vintage valve components There is a way to tighten the screws by squeezing the screw to provide more thread mismatch but it involves disassembly.
I would consider a new set of #2032 Johnson lifters (stay away from 'hollow' Johnson 'style' lifters. ) https://www.fordbarn.com/forum/pictu...ictureid=41159 |
Re: JAX vintage valve components My experience was that if the screw is too far in or too far out, the deformed thread locking mechanism will not be as effective. I think it is also a good idea not to move them too much during adjustment. Keep movement to a minimum.
Mart. |
Re: JAX vintage valve components I had a model A adjustable lifter that liked to wander. I used some red LocTite when I re-adjusted it and it hasn't moved since.
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Interesting. JAX lifters are Flathead Jack's new company. They sure look nice and their price reflects this, but it seems like you've got some bad ones. I'd try to find some NOS or refurbed Johnson's. They work well and without issue for the most part. |
Re: JAX vintage valve components It was the "apparent" high quality of the JAX lifters that persuaded me to purchase them.
They are unlike other adjustables in that the screw is much larger diameter than all the others. I did notice they did seem a little too easy to adjust. I am going to remove them today and see if I can "distort" the threads to give them a more interference fit and use red locktite. These were expensive and I hate throwing my money away!! |
Re: JAX vintage valve components There seems to be issues with most of the repop lifters - especially with the screws loosening. Others have had issues with material quality and hardness. I've not yet tried the Flat Attack lifters - they appear to be very high quality and maybe they don't have these issues.
Given the problems you're having, you might consider either a thin "jamb nut" on the adjuster body or red-loctite . . . or try to compress the adjuster and get more thread interference. The last method might be a little sketchy in that it is hard to "get it right" when you don't have any spare adjusters to swap in . . . if you get it wrong. Best of luck! B&S |
Re: JAX vintage valve components I've used the Flatattack lifters with no problems.
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Re: JAX vintage valve components Today I took the heads/intake off on the driver side and removed the valves and lifters. All the clearances on cyl. 4 - 8 were extreme, some as high as .075. The lifter screws were loose but otherwise the lifter faces looked great, no sign of cam interference.
I took them apart and saw a crappy way of securing the adj. screw to the lifter body. There was a 1/8" hole drilled in the side of the screw with a nylon insert which fell out as I disassembled the lifter. There was no interference fit at all!! I then put the screw in my vice and "distorted" the threads in a number of different areas. Finally I re-assembled with red locktite. Hope it works, they seem really tight now. I believe JAX has improved on these lifters as mine must have been an early production run... I'm still disappointed, for the price I expected more.. |
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https://flatheadjax.blogspot.com/202...e-Lifters.html No current price listed that I could find. |
Re: JAX vintage valve components He sure makes his stuff sound good.
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That is why they are designed the way they are (for short runs) I would never put a hollow 'bronze' lifter in a street engine. https://www.fordbarn.com/forum/attac...8&d=1623762732 |
Re: JAX vintage valve components I think the whole writeup was done by somebody who has no clue about engines, racing engines or anything else. I wouldn't take a single word or paragraph on that website as having anything to do with the truth. It is all uninformed marketing BS . . .
And BTW, the website 'www.flatheadjax.com' . . . doesn't even work . . . |
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Whether it still is under his ownership it to be determined. |
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