Subject: Re: The Big Bang!!
Author: Robert Hawkes
Date: Sep 12, 2002, 6:08 PM
Post ID: 1711000667
Keith, Kev is right on. These engines are nice and simple, easy to see as
the parts are big. No fussy stuff. Take your time, Bob
----- Original Message -----
From: Kevin Graf <kgr-@midwestpension.com>
To: <Loopfram-@topica.com>
Sent: Thursday, September 12, 2002 10:08 AM
Subject: RE: The Big Bang!!
| Kieth, Drain the oil into a clean pan. Starting with a clean pan will allow you |
| know what exactly came out of your engine. with the pan off, look to make sure the connecting rod nuts are still there, 4 total, 2 each rod. Look around the bottom of the pans for anything. Metal flakes, pieces of metal, anything out of the ordinary. If you don't find anything at this time that shows the problem your |
| at a teardown. The "shells" are the bearings, also called plain bearings. There are no rollers, or little ball bearings in a cage. These bearings are a strip of soft metal, oil creats a thin buffer between the bearing and the rod. In order to get to these, your talking pulling the top end, Rockers, heads, cylinders. Then undoing the 4 rod bolts. Each rod will come out in 2 pieces.Yup, their called 2 piece connecting rods. The Big End part of the rod is what mates with the crankshaft(2 piece end). The Small End is where the piston is attached to the connecting rod. The big end bearings are the plain bearings your asking about. There are 2 peices per rod. One on(in) |
| "cap" the other on the rod side. All these parts should be taken apart |
| care and it should be noted how and where they came off and marked accordingly, since mating surfaces should not be interchanged. The big end bearings should be intact and smooth, Although, There will be some wear and grooving. From what it sounds like, your problem seems like |
| should show itself to you without too much detective work. If you decide to do this, I should tell you that before you start tearing everything apart you'll want to check for up and down play in the rod bearings. This can be done when the top end is off. You'll want to grab |
| small end of the rod(preferably without the piston on) and pull straight |
| and down. Any up and down play is technically bad and the bearings should |
| replaced. Take your time with this as the side to side play will want to fool you. Just the up and down matters. If you take your time and inspect & label every part you take off. From start to finsh, look at everything! It's not rocket science, just your |
| internal combustion engine. In my expirance, people have a better |
| with their machine if they learn about it and do it themselves. That way |
| KNOW whats going on in there, and everything starts to makes sense on how |
| all ties in together. If(when) it breaks down again you'll be able to look at it with a new prespective. Hope this helped... Kev -----Original Message----- From: Keith Ruff [mailto:klru-@fcc.net] Sent: Thursday, September 12, 2002 9:22 AM To: Loopfram-@topica.com Subject: RE: The Big Bang!! Bottom end has never been apart, bike sat for a long time, so maybe there is sludge. I'll pull the oil pan and check things out. What should I look for? How do you know if the bearings are bad? I just looked in the Chilton manual I have (it's an old early 70's vintage book) and I can't tell what the bearings look like, unless they are the "shells" they speak about, or do these shells go around the bearing? How do you get the bearings out? Are we talking total engine disassembly here or can this be done working from under the bike with the oil pan off? I do see in the book the little oil holes on the arms, is that the ones that can clog and starve the bearings of oil? If they are clogged how can they be unplugged while in the motor, or again, does this require engine disassembly? Anybody up for a road trip to NJ??????????? Keith Fred Sahms wrote:
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