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Author Topic: siezed motor  (Read 1195 times)

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low550

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siezed motor
« on: March 08, 2009, 07:23:16 PM »
well i have let the p.b.blaster set in my 75 honda 550 motor   for awhile as you fellows suggested now it is still locked up, today i pulled the cam cover off and losened the  cam chain tensioner lock nut but i can't get the screw to come lose. the sprocket bolts are not up where i can get to them to losen them, what now? the cam sprocket won't move. do i have to cut the cam chain? then replace it on the rebuild? any ideas or tips will always be helpfull . i've been reading this forum for a while before joining it and you guys seem so knowledgeable and helpfull ! thanks 
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Offline fmctm1sw

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Re: siezed motor
« Reply #1 on: March 08, 2009, 07:31:33 PM »
I've seen a lot of guys recommend acetone and transmission fluid...
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Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
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Offline bender01

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Re: siezed motor
« Reply #2 on: March 08, 2009, 07:47:54 PM »
Diesel flush?
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75 550 K1
74 750 K4
1968 450 K1 Super Sport
74 750k 836 project
http://www.bikepics.com/members/bender01/
So, the strategy is to lie to people you are asking for help?

I think I'll be busy going for a ride.

Good luck!
Two Tired Quote !

Offline kerryb

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Re: siezed motor
« Reply #3 on: March 08, 2009, 08:50:45 PM »
I thought my engine was siezed because it wouldn't turn over with the kickstart lever.  During the tear-down to find out how bad it was I put a wrench (socket?) on the crank end for leverage and...the engine would turn over backwards a little more than 3/4 of a rotation.  Found out later that the rust was only in the top 3/4 inch of number 3 cylinder.  It seems this allowed me to get the cam stuff undone rather easily.  So carefully try to turn the engine backwards to get cam bolt access.

good luck. 
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intrigued by the wail...seduced by the scream.

low550

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Re: siezed motor
« Reply #4 on: March 09, 2009, 02:24:18 PM »
thanks man i'll try that tomorrow if it is'nt to cold or raining ( no garage ) i did'nt pay a lot for this bike mostly donations of motors and parts from friends, but now it's time to fork up the bucks for the things i can't make myself. ::)
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low550

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Re: siezed motor
« Reply #5 on: March 11, 2009, 05:24:44 PM »
thanks to you kerry b. i put a wrench on the crank bolt and turned it in reverse and voila the motor broke loose, now i can turn the motor over by hand useing the kickstarter peddle. i put everything back together and got great compresion i did'nt have to put much preassure on it to break it free  thanks again man . :) :) :) :) ;D ;D
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Offline BobbyR

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Re: siezed motor
« Reply #6 on: March 11, 2009, 06:02:13 PM »
That is good news low. Let her break in gentle. After the brake in ride the sh1t out of it.
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Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?

Offline kerryb

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Re: siezed motor
« Reply #7 on: March 11, 2009, 06:19:47 PM »
Cool!  That makes me feel good that I could help someone else out.  Maybe this will help me build the courage to spend the money to do my first engine rebuild.  My engine is disassembled down to the cylinders being off to hone the rust out.
The question is ...after scraping out a band of rust 3/4" wide and not too deep, will honing the cylinder be enough to try re-assembly.  How do I figure out the next step.
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intrigued by the wail...seduced by the scream.

Elmo123

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Re: siezed motor
« Reply #8 on: March 11, 2009, 07:23:00 PM »
Quote from: low550 on March 08, 2009, 07:23:16 PM
well i have let the p.b.blaster set in my 75 honda 550 motor   for awhile as you fellows suggested now it is still locked up, today i pulled the cam cover off and losened the  cam chain tensioner lock nut but i can't get the screw to come lose. the sprocket bolts are not up where i can get to them to losen them, what now? the cam sprocket won't move. do i have to cut the cam chain? then replace it on the rebuild? any ideas or tips will always be helpfull . i've been reading this forum for a while before joining it and you guys seem so knowledgeable and helpfull ! thanks 

You got a stuck motor, I used PB Blaster, I put a good amount in the cylinders and let it sit for about 5 days. Then I took off the flywheel cover and used a rathet with the socket to fit the flywhell nut and un stuck the motor. It free'd up nicely. Just my 2 cents.
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Offline JLeather

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Re: siezed motor
« Reply #9 on: March 12, 2009, 09:41:48 AM »
Careful using that nut to turn the engine over.  It's safer to pull the alternator cover off and get a nylon strap-wrench (like for removing oil filters) and turn it by the rotor.  I've broken 5 advancer units by trying to unstick motor with that nut (and I wasn't turning them that hard either).  Those little ears on the advancer are not very strong.

Yeah, acetone/ATF in a 50/50 mix works great.

As for the other guy with the rust in the top 3/4", it depends on how deap it was.  Hone it til there aren't any pits or anything left.  Then measure it and see if it's out of spec.  Chances are you can get away with it, I know I have.
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