Those bores and rings are fine, so no worries on the jugs. That head will be fine with a freshening of the seats and clean up the valves and add new springs ( if the originals dont measure right ). Youre at the finish line now.
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De-stinking Penelope
- Thread starter rustybronco
- Start date
M
Matchless
Guest
See this is why I love this forum, you guys are awesome
Pete, you have just hit the nail on the head!
Dale, once you have it all cleaned up and laid out with the replacement parts on their way you are going to feel much better!
Another motor could be another surprise packet anyway.
Washing up, de-corroding, inspection, measuring, looking up parts, obtaining parts, scraping gaskets off, chasing threads, etching the aluminum, taping off parts, painting, removing broken stud, welding on a new boss, going through starter, assembling...
Home stretch???
Home stretch???
Dont worry about the welding a new boss just yet..may get you a total good lower case too. When you give me the final tally I will get things in order.
Andre, Yes I suppose it could be. This is all about the cost and time to fix this engine Vs. another.
Things like the front sprocket nut and washer being all hacked up, sleeves, seals, orings and 'plugs' all stuffed up. Start clutch shim in addition to the crank, piston and camshaft.
What really gets me is the camshaft. Did they forget to harden these things? The lobes look perfect on it, yet it's worn undersize. That's what really got me...
Case halves are a machined pair. No can do...
The boss is an easy fix anyways; I have a friend with a tig welder.
The boss is an easy fix anyways; I have a friend with a tig welder.
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Thanks spyder! My wallet thinks it's quite the project also.
Cam shaft may have been defective from the factory and it just slipped thru the QC that particular day...My dad worked for GM engine assembly in Bay City MI for many years and said it was an everyday thing to her cams hit the floor. All they did was pick them up and stuff them in the blocks.
By "finish line" I was meaning in the checking and soerting of the engine. And i was thinking, If someone had a lower case that was cracked or otherwise junk could they cut the section that the cover bolts to and you use the posts off it for transplant??
Chuck, Ivor went through four camshafts before he found a good set. This one had an under sized cam @ 22K miles. Who knows how many else go undetected just because they look good upon casual inspection.
It takes time to do all the inspecting and measuring. That's something you wouldn't normally have to do on a bike with a known history, much less one that's had metal rolling around the inside of it.
It takes time to do all the inspecting and measuring. That's something you wouldn't normally have to do on a bike with a known history, much less one that's had metal rolling around the inside of it.
I not rushing you..I totally get it. I was just saying that back in the day there was all kinds of crazy stuff like what my dad said about the GM plant going on and its still happening to this day. I have the factory service manual and will check the lobes when I go over to Randys to be sure I send you a good one.
I've had some worn camshafts too. It happens, maybe because of the GS low pressure oiling system, and all the heat in the head. At any rate, camshafts are cheap enough, but the trick is to find someone that can measure them before you throw down your money.
Oh, and I suspect about 90% of the people don't bother to measure stuff like this...and that cam would run just fine the way it is. Sometimes we (me included) make more work for ourselves because we know too much.
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I know your not rushing me, it was just me talking out loud while I was trying to make some sense out of why the engine is like it is.
Back to checking transmission bearings...
Back to checking transmission bearings...
Who is Ivor?? Its like this probably because of a few possibilites. 1)..may have gotten gas in the oil and the PO(s) didnt know anything about how to look for things and it got spun with bad oil. 2)..was run hard on a low oil level. 3) was one of those Jethro types that would rev it at 12G in neutral all day long to impress his friends with "how badass my bike is".
Or, have a tendency to over think things at times...
I wonder what 'this' cams lobe would measure on a hardness scale?
http://thegsresources.com/_forum/member.php?u=6290
Or, the camshaft was just plain too soft from the factory.
Or, the camshaft was just plain too soft from the factory.
How would you find out what the factory Rockwell standard was???
I don't know if you could find out what it was from the factory. What you could find out is what the cam manufacturers of today use for hardness and compare that to what you have.
The reason I suspect improper heat treatment of both cams, is because the camshaft bearing journals look good, indicating proper oiling, a small bit of metal transfer to one of the shims and both camshafts appear to being close to the limit.
Let's not forget the small block Chevy camshafts of the same era, which were prone to having soft lobes as well.
The reason I suspect improper heat treatment of both cams, is because the camshaft bearing journals look good, indicating proper oiling, a small bit of metal transfer to one of the shims and both camshafts appear to being close to the limit.
Let's not forget the small block Chevy camshafts of the same era, which were prone to having soft lobes as well.
M
Matchless
Guest
Dale,
That is one even I can understand!
Dale, just take your time, its not your only ride! The rebuild is usually a most enjoyable time anyway, so stretch it out if you can.
Even if it takes you 5 or 10 years to complete, so what! As long as you enjoy fiddling with it.
