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Author Topic: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.  (Read 5416 times)

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Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« on: May 16, 2009, 07:08:42 AM »
"Mechanic's touch" is the term I regretfully learned only after realizing it was what I did not have. After two days of watching my neighbor rebuild his moto from the best of two and rebuild an engine, I decided I would give my first oil change a go.
A quarter turn too far cracked the cast aluminum oil pan of my 77' CB550'd engine.
The drain bolt thread had two mega fractures running through it the length of the bolt.
A quick fix was in order.
I removed the oil pan (caked with inches of petrified oil and dirt) and spent the next half hour getting it oil and dirt free to prepare it for the fix; steel reinforced epoxy putty. I just plugged up the the drain bolt thread and the cracks, let it cure 30 minutes and finished my oil change.
So far so good, this should last until I can find a replacement oil pan.


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Offline mystic_1

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #1 on: May 16, 2009, 07:26:27 AM »
Was this the type of epoxy that comes in a stick, that you cut off what you need and then knead to activate?  One brand name is "Fasweld".  I like that stuff, works well.  Did you scuff the surface before putting it on?

As long as adhesion is good that stuff should last years.

Oh, and welcome to the forum :)  Got pics of your ride?

mystic_1
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Offline HondaMan

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix
« Reply #2 on: May 16, 2009, 07:36:15 AM »
Welcome!
We can help you find a new pan, someone here will have one. You've come to the ultimate online parts source for SOHC4 Hondas!  :D

Don't use 10w30 oil at all in this bike. I would recommend 20w50 in the 550, for a pile of reasons, including smoother shifting: be sure to get the type called "Motorcycle Oil" (for convetntional oils) or "Diesel rated" oil (for synthetic oils). These have less detergent, which reduces foaming action in these hi-RPM engines (foam is bad for the crankshaft bearings).
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Offline Industrial Rat400f Killer

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #3 on: May 16, 2009, 08:52:32 AM »
Don't feel bad I've done the same thing before. I figure mine was ready to go because I barely turned it a 1/4 turn after it was finger tight and I herd a snap.

Just scour the internets until you find a replacement. You've already had the oil pan off once so putting on a new will be be a cinch. I'd find a replacement but not put it on until the patched one gave out.
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Offline Johnie

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #4 on: May 16, 2009, 10:48:34 AM »
I agree...get a new pan.  Very cheap on eBay and even cheaper from guys on the board that may have an extra laying around.  I would not wait around until the patch gave out though.  That is just me...I would not want that patch to give out when I am tooling down the highway.
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Offline Hush

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #5 on: May 17, 2009, 03:28:17 AM »
Oh yeah and maybe use a smaller bar on your socket next time, less leverage equals less chance of overtightening. ;)
Welcome to the forum............Hush.
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Offline manjisann

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #6 on: May 17, 2009, 06:47:10 AM »
Welcome to the forum, everyone here is great for helping!

I have an oil pan from a CB500, does anyone know if it would fit this bike? I know some of the parts are interchangeable. If it does, I'd send it to ya for postage plus like $5 donated to the forum.

I finally bought a torque wrench because I'm always overtightening stuff. Busted an exhaust stud of my CB500 doing that.

Brandon
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Offline Johnie

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #7 on: May 17, 2009, 07:30:15 AM »
Motorgrrl...be sure there is a crush washer on that drain bolt.  Correct me if I am wrong guys as I am talking from the CB750 prospective.
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

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Offline Frankencake

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix
« Reply #8 on: May 17, 2009, 07:48:40 AM »
I might have an oil pan here.  Welcome to the forum.  Usually, we like to have an arm wrestling challenge for newbies but it seem that you have already passed the torque test. 
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Offline rchrdms

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix
« Reply #9 on: May 17, 2009, 08:11:00 AM »
I think you could try a welding shop too. I have used Don's Welding where I live in WNY many times. You just have to look around for the right shop, one that won't charge too much for a small job.
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Offline Spikeybike

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #10 on: May 17, 2009, 08:19:10 AM »
i have an oil pan ----   i'd trade it in a heartbeat for a side cover  ;D
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Offline MickeyX

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #11 on: May 17, 2009, 08:41:49 AM »
Welcome to the forum!! Kit and I have had to deal with the PO stripping stuff out and cracking parts. It's no easy task tracking these old parts down sometimes. If it was me, I'd take one of these guys up on their offer. They've helped us out more times than I can count with parts and good advice. (2 chicks successfully rebuilding a CB650 could be considered a circus act in some states)

If it was me, I'd replace the pan and do the gasket while you are there. One less thing to have in the back of your mind when you're screaming down the highway at 95. (you know you will  :D). Blowing oil out the bottom and all over your back tire can't be a good thing.

Good luck. Pics please.  ;D
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Offline Spikeybike

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #12 on: May 17, 2009, 09:14:53 AM »
i have a new gasket as well  ;D

lemme know if ya want um
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Offline Flying J

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix
« Reply #13 on: May 17, 2009, 02:33:57 PM »
oil pan for a`side cover? ive got a front axle ill trade you for a stock seat. Sound fair? ::)
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Offline Spikeybike

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Re: Girl. CB550. oil change. over tightened drain bolt. cracked oil pan. the fix.
« Reply #14 on: May 17, 2009, 02:41:37 PM »
Na.. i'd do a square deal ... i just really need a side cover  ;D...   

uuuuh say  $20 for the pan and gasket?
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