jackshaft bearings
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- sevenmilebridge
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jackshaft bearings
Does anyone have any ideas on removing and replacing the jackshaft bearings or do I have to get a machinist to do it
65 Mustang work in progress 69 2000 Dialed in 69 2000 work in progress 70 1600 work in progress
- Habitat.pat
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Re: jackshaft bearings
I’ve always had the machinist do it, it requires a special tool.
Peace,,
Pat
Peace,,
Pat
67.5 SPL311 Stroker Restomod
Pat Horne, Near Austin, TX
We support Habitat for Humanity
A hand UP, not a hand OUT
Pat Horne, Near Austin, TX
We support Habitat for Humanity
A hand UP, not a hand OUT
- Gregs672000
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Re: jackshaft bearings
I know this sounds crazy, but unless those bearings are showing clear wear, they don't always need to be replaced. Per my previous very thorough engine guy, they are not under a lot of load ever. While I did go ahead and have them replaced in this last engine as it was at the machine shop for a bore and hone anyway (different block than before), I'm confident the previous motor saw at least 300k miles over 34 years, some years of daily driving. Your mileage may vary as they say, but for what it's worth I think their replacement CAN be optional.
Greg Burrows
'67 2000 #588
Tacoma, WA
'67 2000 #588
Tacoma, WA
- Habitat.pat
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Re: jackshaft bearings
Greg,
I agree up to a point. In the “older daysâ€, when everything was hot vatted, the acid was guaranteed to kill the bearings. Since hot vats are now few & far between, the bearings are much more likely to still be good, but personally, I’d rather pay an extra $75 for bearings & installation than have to pull the engine again & do a rebuild because a reused bearing let go.
I’m finally getting ready to reassemble my engine & will be checking with tool lenders/renters to see I can find the tool set so I can install the bearings myself. It’s not that difficult to do.
Peace,
Pat
I agree up to a point. In the “older daysâ€, when everything was hot vatted, the acid was guaranteed to kill the bearings. Since hot vats are now few & far between, the bearings are much more likely to still be good, but personally, I’d rather pay an extra $75 for bearings & installation than have to pull the engine again & do a rebuild because a reused bearing let go.
I’m finally getting ready to reassemble my engine & will be checking with tool lenders/renters to see I can find the tool set so I can install the bearings myself. It’s not that difficult to do.
Peace,
Pat
67.5 SPL311 Stroker Restomod
Pat Horne, Near Austin, TX
We support Habitat for Humanity
A hand UP, not a hand OUT
Pat Horne, Near Austin, TX
We support Habitat for Humanity
A hand UP, not a hand OUT
- Gregs672000
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Re: jackshaft bearings
Agreed, it was more of an option in case he was worried that they had not been done, or that it would be a special trip to the shop only for the bearings. Of course, new is (almost) always better!
Greg Burrows
'67 2000 #588
Tacoma, WA
'67 2000 #588
Tacoma, WA
- redroadster
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Re: jackshaft bearings
The Babbitt type bearings are pulled in by a bolt fixture or a driver and mallet like doing cam bearings in the car
This usually mushrooms them a bit so then a adjustable 5-6 blade cutter is used to mill back even ... I'd bet it's hard to rent though
This usually mushrooms them a bit so then a adjustable 5-6 blade cutter is used to mill back even ... I'd bet it's hard to rent though
Datsun dealer tech 76 to 87
Mitsubishi tech 9 yrs
Volvo, Kia, Toyota too
6 month - Rolls Royce
ASE MASTER TECH 96. - 11
70 SPL 86 Z31 T , Sportster
Mitsubishi tech 9 yrs
Volvo, Kia, Toyota too
6 month - Rolls Royce
ASE MASTER TECH 96. - 11
70 SPL 86 Z31 T , Sportster
- SLOroadster
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Re: jackshaft bearings
The front jackshaft bearing does see a lot of load. The two times I've rebuilt my engine, the first one has shown a lot of wear, the other two, looked better. It might have something to do with running a higher lift cam, and stronger valve springs, and turning it faster than most people do. Still, they aren't that expensive, and why take the risk of reusing them when everything is apart anyway? That front bearing does see a lot of sheer load from the timing components.
Will
Will
Sorry, I find modern engine swaps revolting. Keep your G, R, or U series in your Roadster!
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Re: jackshaft bearings
is there anything unique about the bearings that makes it better if you get them for the shop or are they something any machine shop will be able to source. i’m sure the place that has my block has probably never done a roadster,
Charlie
Grafton WV
68 2000
70 1600
71 Toyota Celica ST coupe
74 Toyota Celica GT coupe
Grafton WV
68 2000
70 1600
71 Toyota Celica ST coupe
74 Toyota Celica GT coupe
- sevenmilebridge
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Re: jackshaft bearings
Well I just bit the bullet and had the machine shop do it had a local guy that had the right tools just took a few minuets to do.
65 Mustang work in progress 69 2000 Dialed in 69 2000 work in progress 70 1600 work in progress
- redroadster
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Re: jackshaft bearings
Heck You've won the lottery if you can find a machine shop that isn't swamped with diesel fleet work $$$$ $
and will be interested in your tiny $ project
and will be interested in your tiny $ project
Datsun dealer tech 76 to 87
Mitsubishi tech 9 yrs
Volvo, Kia, Toyota too
6 month - Rolls Royce
ASE MASTER TECH 96. - 11
70 SPL 86 Z31 T , Sportster
Mitsubishi tech 9 yrs
Volvo, Kia, Toyota too
6 month - Rolls Royce
ASE MASTER TECH 96. - 11
70 SPL 86 Z31 T , Sportster