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Cylinder barrel STUCK to crankcase... suggestions? #134042
01/31/08 12:49 am
01/31/08 12:49 am
Joined: Mar 2005
Posts: 460
Cincinnati, Oh
Jethro Offline OP
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Jethro  Offline OP
BritBike Forum member
Joined: Mar 2005
Posts: 460
Cincinnati, Oh
Poopy. I have a 71 T120 650, and the cylinders will not lift off the case. Eight nuts removed, and I've done a search on the forum, and tried the moving pistons up and down, then I tried it with the old cylinder head on and plugs in to help with a little compression, but it still won't lift off. J$&#(@@(*@)( (fill in the blank)... ideas?

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Re: Cylinder barrel STUCK to crankcase... suggestions? #134043
01/31/08 1:30 am
01/31/08 1:30 am
Joined: Sep 2007
Posts: 492
Maine
Sisyphus Offline
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Sisyphus  Offline
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Joined: Sep 2007
Posts: 492
Maine
I heard of someone once with a similar problem. They ended up making a tap on a grease gun that fit the spark plug holes and pumped grease into the cylinders to get the block to come off the cases or some such thing. Hydraulic pressure is effective but powerful, and power is useless without control. Use wisely!


There is no such thing as a sympathetic vibration.
Re: Cylinder barrel STUCK to crankcase... suggestions? #134044
01/31/08 1:47 am
01/31/08 1:47 am
Joined: Apr 2006
Posts: 1,708
Virginia, USA
SBoyd Offline
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SBoyd  Offline
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Joined: Apr 2006
Posts: 1,708
Virginia, USA
If you have one of those "salamander" garage heaters, heat the cylinder block 'till hot to touch.
This will help release the gasket cement.
Then tap on the fins side to side with hyde mallet.
Hammer only directly inward on the fins, not up or down, and you will not break them.


Stop the insanity.
Re: Cylinder barrel STUCK to crankcase... suggestions? #134045
01/31/08 3:08 am
01/31/08 3:08 am
Joined: Nov 2004
Posts: 1,694
georgia
T
trumpetloon Offline
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trumpetloon  Offline
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T
Joined: Nov 2004
Posts: 1,694
georgia
Call Gallagher... sounds like a job for Sledge-O-Matic.

Seriously though... get a chunk of 2 by 4 and a 2 to 5 pound hammer. Using the wood block as a pillow, LIGHTLY rap the fins with the hammer,at 90 degrees to the fins, only a bump or two, going around the jug in steps. I say use a heavier hammer here as the inertia of the slow, deliberately light blow is the key for shock but not trauma.

Check for loosening often... once things start to move put the big guns away and rock it by hand to finish breaking it free.


1974 TR5T
Re: Cylinder barrel STUCK to crankcase... suggestions? #134046
01/31/08 3:45 am
01/31/08 3:45 am
Joined: Mar 2005
Posts: 460
Cincinnati, Oh
Jethro Offline OP
BritBike Forum member
Jethro  Offline OP
BritBike Forum member
Joined: Mar 2005
Posts: 460
Cincinnati, Oh
I appreciate the suggestions a BUNCH. I've had too much wine tonight to hammer at it... I'll try it tomorrow. I don't want to use the grease yet... pretty drastic, and unfortunately I'm working in my dining room, I can't really heat the cylinder barrels too easily... the light hammering I'll try. Wish me luck

Re: Cylinder barrel STUCK to crankcase... suggestions? #134047
01/31/08 3:51 am
01/31/08 3:51 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
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Tiger  Offline
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Joined: Oct 2004
Posts: 4,429
Melbourne Australia
No bludgeoning required.
Get a 1/2" SAE open spanner and use it to gently "cam" between the crankcase and tappet block locating bolts, working 'fore and 'aft between intake and exhaust.


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: Cylinder barrel STUCK to crankcase... suggestions? #134048
01/31/08 4:16 am
01/31/08 4:16 am
Joined: Aug 2006
Posts: 110
Northern California
2
2ndchildhood Offline

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2ndchildhood  Offline

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2
Joined: Aug 2006
Posts: 110
Northern California
Cut two blocks of 3/4" wood to fit inside the cylinders, on top of the pistons. Bolt a bar across the cylinders with the head bolts. Then gently turn the crank so that the pistons push the blocks into the bar, and it will lift the cylinders right off.

Illustrated here.


-Tony

73 Norton Interstate
72 Triumph T100R
67 BSA 441
Re: Cylinder barrel STUCK to crankcase... suggestions? #134049
01/31/08 4:32 am
01/31/08 4:32 am
Joined: Feb 2004
Posts: 1,956
Flint,Mich
norbsa48503 Offline
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norbsa48503  Offline
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Joined: Feb 2004
Posts: 1,956
Flint,Mich
Lots of ways. Single edge razor blades a tiny hammer and some time will do the trick as well. You just need the start of the move not motion.


norbsa
1960 TR6
1963 Super Rocket
1965 650 Star
1966 441
1968 Thunderbolt
1969 Twinkle 250
1972 Fastback
1974 Roadster
1970 S.S
Way too many BSA's not named
http://decentcycles.com
Re: Cylinder barrel STUCK to crankcase... suggestions? #134050
01/31/08 1:43 pm
01/31/08 1:43 pm
Joined: Mar 2005
Posts: 460
Cincinnati, Oh
Jethro Offline OP
BritBike Forum member
Jethro  Offline OP
BritBike Forum member
Joined: Mar 2005
Posts: 460
Cincinnati, Oh
Quote:
Originally posted by Tiger:
No bludgeoning required.
Get a 1/2" SAE open spanner and use it to gently "cam" between the crankcase and tappet block locating bolts, working 'fore and 'aft between intake and exhaust.
No damage to anything, and 15 seconds later, the seal was broken, THANK YOU, and although ppl may look at me funny, next time I'm in a bar with a pint, I will raise a toast to tiger.

Also, thanks to everyone for the other great tips. Could not get to them all, but I will file them away for the next job.

Re: Cylinder barrel STUCK to crankcase... suggestions? #134051
02/01/08 1:29 am
02/01/08 1:29 am
Joined: Sep 2007
Posts: 492
Maine
Sisyphus Offline
BritBike Forum member
Sisyphus  Offline
BritBike Forum member
Joined: Sep 2007
Posts: 492
Maine
Oh, the grease trick was with someone who had bought an engine of unknown provenance, PO said it was "seized" but didn't know much else. End result was a wrist pin circlip had come out and wedged itself between piston, rings, and cylinder wall. Yikes. I didn't realize you were just disassembling the top end, sorry.


There is no such thing as a sympathetic vibration.
Re: Cylinder barrel STUCK to crankcase... suggestions? #134052
02/01/08 2:01 am
02/01/08 2:01 am
Joined: May 2007
Posts: 790
pa.
J
jays375 Offline
BritBike Forum member
jays375  Offline
BritBike Forum member
J
Joined: May 2007
Posts: 790
pa.
The grease gun trick work rather well on a stuck motor.I've seen a set up motor freed up this way.It had sat along time.Once things were cleaned up and put back together it ran like a top.All that was installed was a set of new rings.The cylinder walls were in nice shape after a quick clean up.If you do a little bit each cylinder your okay.Just found the fittings the other day used to do that job.Just brazed a reducing bushing in a old hollowed out spark plug.Then screw in the grease fitting.

Re: Cylinder barrel STUCK to crankcase... suggestions? #134053
02/02/08 8:40 am
02/02/08 8:40 am
Joined: Jun 2007
Posts: 152
Honolulu, Hawaii, USA
mecchanica Offline
BritBike Forum
mecchanica  Offline
BritBike Forum
Joined: Jun 2007
Posts: 152
Honolulu, Hawaii, USA
Sometimes it's as easy as sticking a screwdriver on top of a cylinder base stud and backing the nut all the way up to push on the bottom fin. Gently, and work around the cylinder to find the weak link. Work the screwdriver to apply the force at the root of the fin, to minimize chances of breakage.


What, me worry?

Moderated by  John Healy 


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