PTO removal

[SeaDoo-Skier]

hello

i just purchased a SBT engine and for the life of me i cannot get the PTO off my old block. Could anyone help me with any ideas on how to remove it.

Ive tried the monkey wrench with no luck.

[george]

impeller tool.

[langford2000]

I know this may sound a little primitive but it worked for me. I just pulled the pto off my first SD (720) the other day. I used a chain wrench around the pto, laid the engine on my WOOD floor in the shop (I wouln'd try in on concrete) and propped the wrench on my work bench shelf so that the engine was supported by the wrench about an inch. I then stepped up on the engine the pto slowy started to move. Bingo loose pto. Now I'm sure there is a more technical way, but hey that worked. [img]smile.gif[/img]

[ccwhit7]

Try a little heat. Or you need a pipe wrenchor chain wrench with long handle for torque . Have a buddy stand or hold the motor and apply pressure using foot and body wait at the end of wrench. I know this is not how a shop would do it but works for me.

[Bill O'Neal]

Use alot of heat. An acetelene torch can be very handy when removing pto's.

Also, air tools are about useless. You need a long breaker bar, a prop tool, and a cheater bar/tube over the breaker bar..

I use an engine stand to secure the motor, but a motor that is tied to the trailer with tie straps can work too.

[Iron Flight]

I agree with most of the comments above - use an impellor tool, breaker bar, a LONG cheater extension, heat, etc...

One additional observation from doing a couple of these. To break the PTO loose, you either need a very large steady force or a really sharp "shock" force. To get that sudden shock, the engine needs to be held by something with no give. Bill's engine stand is a great example. I have had no luck with people holding it - they have too much give. I have even backed a fire truck's rear wheel up against the block - the rubber tire still has too much give, and the shock is disapated. I finally found a spot in our shop that has a heavy steel bracket bolted to the concrete wall, with a concrete floor underneath. I wedge the engine under there, and bingo - no movement whatsoever. That gives me a solid mount so that I can pop the PTO with the long cheater.

One other thing - I have cut too many rags in half stuffing them in the exhasut port. If this happens to you, us the indian rope trick - fill the cylinder with rope through the spark plug hole - nothing to cut (I suppose you might bend a rod either way.....) !

Good luck!

Paul

[Bill O'Neal]

PTO Flywheels.

Here is a trick that works very well on 580-720 engines.

Secure the engine to something solid.
Put as much pressure as you can on the breaker bar and whack the side of the pto with a 2 lb hammer. The viberations will loosen the pto and it will usually just spin right off. No heat necessay usually.

I have removed viturally hundereds of pto's. Heat works best, but can and will damage the rear crankcase oil seal. Not a problem if you are rebuilding the motor and installing new seals. A big problem if you are not, such as changing out a pto with stripped splines and not rebuilding.

All XP800 engines (787) come off fairly easily, except 1995 787 models with fine threads on the end of the crankshaft. That is why SD put coarse threads on the 1996 and later cranks. There is a lockup tool that replaces the starter motor and locks the front mag flywheel. I never liked rags in the ports or ropes in the clyinders too much, but in a pinch.... Better to remove the head and put something solid under the head in the clyinder and then re-install the head. I use a piece of round white plastic 1.5 " in diameter by 2" tall. It leaves no marks. A big socket will work.

Magneto flywheels. Never heat a magneto flywheel that has magnets in it. Use a puller. Again, a whack with a hammer on the big puller center bolt will get them to pop right off usually, if you tighten the bolt very tightly first. The shock will viberate it enough to break it loose, and it will pop off.

787 and 951 flywheels have some very fine threads (38mmX1.5) around the center hub. There are pullers available to screw onto that hub, after removing the magneto cup from the flywheel to get more threads into the puller. Trust me, you can strip the threads if you do not remove the cup first.

Plan in advance. These tools are now being manufactored by aftermarket companies and are not that expensive to buy.

[ July 02, 2003, 11:45 PM: Message edited by: Bill O'Neal ]

[TurboFan]

Everything I read about removal of PTO's involves the motor... well my engine came in a box taken apart so I have a crank, with a PTO on it (with a broke rod and no piston on the other rod). What's your suggestion here so that I can somehow spin off the PTO?

[TurboFan]

I should be able to clamp my outermost cheek in a vise and spin off the pto counter-clockwise correct?

[Technical Support]

correct, the PTO spins off counter-clockwise