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01-08-2021, 02:27 PM | #1 |
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King pin replace
Will the king pin reamer that Snyder's catalog has for sale work ok for a do it youself at home mechanic. I have a new old stock king pin set that I will be using?
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01-08-2021, 02:33 PM | #2 |
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Re: King pin replace
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01-08-2021, 03:22 PM | #3 |
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Re: King pin replace
I would take it to a local machine shop and have it honed. It will be better and if you are doing one it might even be less expensive.
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01-08-2021, 03:54 PM | #4 |
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Re: King pin replace
Yes, did it. Be sure to replace the bushings in a sequence. After pressing in one new bushing, run the reamer through the old bushing into the new bushing so the bore is centered. After pressing in the remaining bushing run the reamer through the "just reamed" bushing to ensure the remaining bushing is reamed true. Take your time, use cutting fluid, and keep the reamer free of chips to the max possible (make the cut in steps and clean the reamer in between cuts). Should have a nice fit afterwards. Good luck.
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01-08-2021, 04:27 PM | #5 |
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Re: King pin replace
I agree with all the suggestions above. There is nothing worse than going thru a lot of work only to find that you have kings pins that are slightly loose and you haven't even used them yet. Years ago I did this job at home and I borrowed an adjustable reamer. You would turn an adjuster to advance the knives and then lock them in place before use. If I knew what I was doing, it should have done a good job. I also found that the pins can be poorly manufactured, being out of round. You end up taking too much material out of the bushings when in fact you are chasing high spots on the pins. It is best to let a professional do the job. Ed
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01-08-2021, 04:40 PM | #6 |
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Re: King pin replace
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JayJay
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JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
01-08-2021, 05:06 PM | #7 |
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Re: King pin replace
If you do use a reamer, be sure you never turn it counterclockwise. You can ruin it with one little twist backwards.
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01-08-2021, 05:15 PM | #8 |
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Re: King pin replace
A good machinist can do the job and give you peace of mind. Most likely at less cost than the reamer.
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01-08-2021, 05:24 PM | #9 |
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Re: King pin replace
Whenever this topic comes up, people chime in saying the bushes should be honed. NO! we are looking for a ROUND hole on size. Honing will not make an oval shaped hole round. A ream will.
I ream till they are still a bit tight, then use the part of an old king pin that was in the axle and some lapping paste to burnish them to a good fit. I end up with contact all the way around the bush, not just on the tops of ridges left by the ream. A thorough clean before assembly is a must
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01-08-2021, 09:18 PM | #10 | |
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Re: King pin replace
Quote:
All the stories about ridges and chatter were done with adjustable and straight blade reamers. They were reamed at the factory. Bill |
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01-08-2021, 09:38 PM | #11 |
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Re: King pin replace
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01-08-2021, 09:39 PM | #12 |
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Re: King pin replace
Emphasis on a GOOD machinist. He will give you a good final fit. I don't know how cheap the reamers are or your skill, but when I had mine done it was cheaper than buying the reamer and he placed the bushes also. I supplied the parts.
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01-08-2021, 09:53 PM | #13 | |
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Re: King pin replace
Quote:
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01-09-2021, 01:29 AM | #14 |
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Re: King pin replace
You don't want a round hole????
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01-09-2021, 01:51 AM | #15 |
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Re: King pin replace
Are you saying a Sonnen pin hone does not make round holes in kingpin bushings?
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01-09-2021, 03:00 AM | #16 | |
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Re: King pin replace
Quote:
Apart from the difficulty keeping square and parallel, the hole may be round if it was round before using that machine. As I said, a hone will not make an oval hole round. It will only follow the shape that was there before the hone was used.
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I'm part of the only ever generation with an analogue childhood and a digital adulthood. Last edited by Synchro909; 01-09-2021 at 03:35 AM. |
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01-09-2021, 03:39 AM | #17 | |
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Re: King pin replace
Quote:
if precision reaming is good enough for aircraft wrist pin bushings it's good enough for king pin bushings. Bill |
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01-09-2021, 05:31 AM | #18 |
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Re: King pin replace
Reaming is fine, especially precision reaming but honing has limitations as I have described.
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01-09-2021, 06:04 AM | #19 |
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Re: King pin replace
My kingpins are the original and a bit worn to about .810 diameter. I bought a 13/16 reamer off eBay (.8125 diameter). I replaced the most worn bearing first and used the other one as a guide, then replaced the other bearing using the first one as the guide. The reamer flutes are long enough to go through both bearings at the same time. The reamer in good condition cost me 35.00 + shipping. Worked for me.
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01-09-2021, 09:44 AM | #20 |
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Re: King pin replace
I just did my king pins using the Snyders reamer on my first Model A. Long time Model T guy (30 years) enjoying my new 28 Roadster. I followed the Les Andrews book. I pressed in both new bushings first, then did the reaming. The reamer has a smaller front end that does a preliminary reaming and keeps the reamer in line with both bushings as the second wider part of the reamer passes through the bushing. Flip the spindle over and do it again. Nice results, king pin fits nicely without play.
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01-09-2021, 05:40 PM | #21 |
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Re: King pin replace
"Honing will not make an oval shaped hole round."
Tell that to the Sunnen Corp that has made millions of machines for making odd shaped holes round and straight.. The model numbers for your info are: Sunnen LBB-1699 Rod Hone plus AG-300 Precision Gauge. You can find pictures by searching with those numbers. Many parts are precision reamed at the factory, BUT, they are not held in a bench vise with the reamer turned by a hand held Crescent wrench. The double piloted step cut reamers used at the factory cost way more than most home mechanics will spend for the ocassional job. In fact, they cost more than a pair of brand new spindles. As for reconditioning connecting rods, it can NOT be done RIGHT with a hone alone. You do the big end first, then you BORE the small end bushing so the center to center length is proper and the small end is parallel to the big end and on size. All of this needs to be done on a machine designed for the job such as a Hydrobore or a PW jig borer. Neither of which will be found in the average auto hobbiest's shop. |
01-09-2021, 06:13 PM | #22 |
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Re: King pin replace
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01-09-2021, 06:21 PM | #23 |
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Re: King pin replace
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01-09-2021, 07:30 PM | #24 |
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Re: King pin replace
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01-09-2021, 07:33 PM | #25 |
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Re: King pin replace
Concur with Bill. I would prefer to buy special tools and try and do the job rather than farm it out. Experience is a great teacher. Just my $.02.
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01-09-2021, 08:24 PM | #26 |
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Re: King pin replace
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Last edited by J Franklin; 01-09-2021 at 09:11 PM. |
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