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General Category >> Rubber Side Down! >> Is a stock crank supposed to look cooked?
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Message started by Paraquat on 05/17/12 at 19:25:38

Title: Is a stock crank supposed to look cooked?
Post by Paraquat on 05/17/12 at 19:25:38

http://i687.photobucket.com/albums/vv231/Paraquat_bucket/piston-1.jpg
Mine looks like that. I got nervous at first because the last time I saw a crank like that the rod had almost fused to it.

http://i.ebayimg.com/t/Suzuki-LS650-Savage-LS-650-Crank-Shaft-Rod-03-/00/$(KGrHqMOKpgE1q5!EFTFBNdQTQsfeg~~_3.JPG
Did a google search and found that one. See how it looks cooked on the side? So maybe I didn't cook mine and that's how they join the halves together? I haven't looked into it but I know it's a roller bearing so I could see them heating it up, pressing it on, and letting it contract as it cools.

I just wanted to rering for this season. Wasn't looking into a tearing down the case.

--Steve

Title: Re: Is a stock crank supposed to look cooked?
Post by justin_o_guy2 on 05/17/12 at 19:31:09

How many miles on it?
Why you re-ringin it?
Hows the bore look?

Hows the piston look?

Wrist pin wear pattern?

Title: Re: Is a stock crank supposed to look cooked?
Post by Paraquat on 05/17/12 at 21:12:18

13k and change
Because it's apart
Little skirt wear front and back, typical wear. The sides still show cross hatch
More wear on the intake side of the skirt than the exhaust side skirt
Looks like it made a couple full revolutions but nothing I'd say is bad.

I took the cover off for a Verslavy tensioner. I thought I could use my time to remedy a small oil leak. The "yellow" bolt broke on me when I first did the oil plug replacement many moons ago. This allowed a bit of oil to soak the cavern where the spark plug is. I also wanted to port the head because I'm doing the Lancer VM36 carb and a 1.5" ID exhaust. Rings are 25 bucks so I figured I'd just swab it with the honing stones, re-reing it, lap the valves while I was in the head, and slap it all back together.

--Steve

Title: Re: Is a stock crank supposed to look cooked?
Post by justin_o_guy2 on 05/17/12 at 21:54:19

slap it all back together.

Thats what Id do,, Id pretend I* didnt see anything on the crank that bothered me,

Title: Re: Is a stock crank supposed to look cooked?
Post by Paraquat on 05/18/12 at 06:23:49

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1302590146/0
3rd picture down. One side of this dude's crank is darker than the other. I'm going to say it's the assembly process and move forward. I really didn't want to split the case.

--Steve

Title: Re: Is a stock crank supposed to look cooked?
Post by justin_o_guy2 on 05/18/12 at 07:45:35

Im sure they heat it, I thot you missed an R & said it looked crooked,,If the wrist pin centerline is the same as the crank,, run it,,no way did the inside of that engine get hot enough to discolor that crank,,the oil woulda caught on fire first,

Title: Re: Is a stock crank supposed to look cooked?
Post by Oldfeller on 05/18/12 at 11:28:30

The crank is a pressed together assembly of heat treated parts, parts which got heat treat processed at different times (perhaps even from different vendors). This is what you are looking at.

If you think a bearing got that hot, forget about it -- it would have locked up completely long before discoloring that entire steel mass.

Put your bike back together and ride it.

Title: Re: Is a stock crank supposed to look cooked?
Post by Paraquat on 05/18/12 at 11:39:36

Figured as much as it's a roller bearing. Thanks guys.

--Steve

Title: Re: Is a stock crank supposed to look cooked?
Post by stratman on 05/18/12 at 22:55:19

I think i got "baked" by some paraquat in the 70's...stratman