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11-28-2015, 08:52 AM | #1 |
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Location: Eastern Wisconsin
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Wrist pin dilemma
I have been tracking a high pitched knock that I thought was a rod bearing. I dropped the pan and adjusted rods but they were all 2-3 thousandths. I adjusted them all to 1.5 - 2 thousandths and replaced pan. Still had knock plus massive oil leak so I pulled engine. Surprised to see counterbalanced crankshaft, hardened valve seats, adjustable lifters, etc. anyhow the knocking showed up at cruising speed with no load on engine and at high idle. Found wrist pin on #3 is very loose. Can I buy some bushings from one of the vendors and simply remove and pressing new bushing than ream bushing? The wrist pin seems like it has slight wear as well. The other thought I had was that I could use an older wrist pin that I have which measures about .003-.004 larger and ream the piston and existing bushing to fit. I don't have the money to have a bunch of machine work done right now. Is there a secret to pressing out old bushing and pressing in new?
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11-28-2015, 09:32 AM | #2 | |
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Re: Wrist pin dilemma
Quote:
Why not spend a little bit of money and take it to a good engine shop, to have the bushing installed and honed. ( .003-.004 probably will not clean up the bushing that is in the rod.) |
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11-28-2015, 09:55 AM | #3 |
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Re: Wrist pin dilemma
Yes! But!...... Watch very carefully! If your wrist pin is worn and you decide to replace it, wrist pins vary in mass and weight due to different size hole in the center. You may have to replace all four. George is absolutely correct in what he says about 90 deg.and the honing.
Terry |
11-28-2015, 10:08 AM | #4 |
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Re: Wrist pin dilemma
The wrist pin needs to be honed for a .0005" fit and is done on a special machine. That shouldn't cost much to have a machine shop do it, but be careful to find a good machine shop. When I overhauled a Wisconsin engine for a guy I had the machine shop hone the wrist pin, but it came back as loose as the one I replaced. The young kid didn't know what he was doing. It used to be a good machine shop until 15 years ago when a lot of new help replaced the guys that retired.
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11-28-2015, 10:40 AM | #5 |
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Re: Wrist pin dilemma
The pin needs to be fit into the piston and the rod as a set.
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Bob Bidonde |
11-28-2015, 11:03 AM | #6 |
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Re: Wrist pin dilemma
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11-28-2015, 11:11 AM | #7 |
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Re: Wrist pin dilemma
Bill is there some times the last that I heard. But I' sure his Son will know what to do. That would be a good move.
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11-28-2015, 04:02 PM | #8 |
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Re: Wrist pin dilemma
Buy a set and do them all at the same time. If that one is gone the rest may be on the way it also. That way they will be the same weight.
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11-29-2015, 11:56 AM | #9 |
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Re: Wrist pin dilemma
I also would buy a set of new pins. They come in several oversizes. Doing this will ensure all are tight and fit the pistons as well as the rods. e-mail me at jimb4e4@gmail if you can't find oversize pins locally.
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04-07-2016, 10:56 AM | #10 |
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Re: Wrist pin dilemma
I am guessing the pistons can come out without pulling the engine.
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04-07-2016, 11:56 AM | #11 | |
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Re: Wrist pin dilemma
Quote:
Bill W.
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04-07-2016, 12:04 PM | #12 |
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Re: Wrist pin dilemma
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04-07-2016, 01:18 PM | #13 |
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Re: Wrist pin dilemma
One (1) possible phone call to Mr. Stipe ..... plus mentioning all above helpful advice to him ..... plus a possible five (5) minute ride to Mr. Stipe's shop ....... (if deemed necessary) ...... all sounds like a large "IRS Refund" received in today's mail.
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04-07-2016, 08:43 PM | #14 |
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Re: Wrist pin dilemma
Seriously, UNUSUAL piston pin problems should be referred to a competent auto machinest! They're EXPERTS & know what they're doing.
Bill W.
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04-07-2016, 10:41 PM | #15 |
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Re: Wrist pin dilemma
I think our Mr. Bill W. is hinting on several outstanding mechanical adjectives ...... UNUSUAL ........ compentant .............EXPERTS ...... coupled with a machinist who knows what he is doing.
Can anyone imagine just a very slim possibility as to "why" #3 piston pin got worn and loose ............. and not #1, #2, & #4 .......... with exact same oil in oil pan and connected to a balanced crankshaft? "Maybe" a very slim possibility of a very slightly bent connecting rod rotating at 1,800 rpm = 108,000 revolutions per hour ............ and a little (2) hour trip one way in a Model A = 472,000 connecting revolutions. Competent machinist are used to evaluating wear coupled with rpms. May sound inexpensive even to replace all (4) pistons and replace all (4) pins ..... but, possibly then develop the same #3 ever increasing high-pitched knock over time. Maybe something to consider ...... maybe not. Last edited by H. L. Chauvin; 04-07-2016 at 10:42 PM. Reason: typo |
04-08-2016, 04:49 AM | #16 |
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Re: Wrist pin dilemma
When a machinest does a piston pin job, aligning the rods is a part of the job!!
Bill W.
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