Part of Service Manual Needed for head teardown

[xj11yamaha]

well i need part of service manual becuase i want to tear down the top half of my motor to clean out the crap that had built up over the years of sitting on the floor of a shop... iv'e checked the tops of the pistons from the sprk plg holes and they look ok, but i knwo theres a little bit of silica sand thats sitting in there ( because the shop it was sitting it had been used for sandbalsting a plymouth cuda body down, the motor had been plugged but still got soem sand in it) and i dont want to start the engine like that so any sugestions would be appreciated.... thanks! iv'e blow LOTS of commpressed air throguh the engine and some penetrating spray as told to by my yamaha dealers mechanic ( i know him he siad that it would clean it up good but that i should tear down anyway to be safe )

thanks , jr:

[ratbyk]

Tear Down

Just a suggestion, the decision is yours BUT! if it was mine, while the engine is still sitting on the floor, no carbs, no exhaust pipes, no spark plugs in it.
I would hook a battery up to the starter and spin the sucker over for about 30 seconds. Let the engine pump out everything that it can. Then squirt a little oil down the plug holes and spin it over again for about 30 seconds. Now get your light and have a look down into the cylinders. I would bet that they look pretty good.
You may do more damage to the engine by stripping it than if you just follow my suggestions. I know sand blast sand gets everywhere in a shop when used but if the had been covered off and was just an innocent bystander with out the blaster being turned on it I'm betting it will be OK.
After reinstalling in the bike change the oil and filter in the first 100 miles and go out and enjoy your scoot.
Ken/Sooke

[xj11yamaha]

well i think if we spun it over with the starter it would be too fast so im just going to crak it over by hand for now... thanks

[ratbyk]

Crank Over

You want the speed to pump out any debris in the cylinder. Hand cranking won't be fast enough. Any crap in the cylinder while hand cranking is just going to go up and down with pistons.
Trust me on that.
Ken/Sooke

[xj11yamaha]

i'm still concerned that if we spun it with the starter that some of the sand would get down into the botton of the engine, i still need a manual for other stuff in anobody has a PDF version, thanks

[John]

Do you have access to a shop vac? You'll need some duct tape (handyman's secret weapon) and adapt some steel brake line to the vac's hose, and stick it in the sparkplug hole to try to suck anything out. Maybe even blow compressed air in there at the same time and really get things stirred up

handyman's secret weapon=Red Green

[ratbyk]

Debris In Engine

From the combustion chamber/cylinders the only way anything can get into the bottom of the engine is past the piston/rings/cylinders. If that seal will hold back compression pressures of 150-200 psi/combustion pressures of who knows?(500-600psi) Then sand or anything visible to the eye is not going to make it past. Inside the cam cover yes, it is going to end up in the bottom. But that is what oil filters are for. Anything the size of a grain of sand will not pass through the filter and on to the bearings.
An engine is really just a big air pump.It breaths air in and out. Along the way we trick it by introducing fuel then trick it again by burning it before pumping it back out again.
Let the engine do it's thing and pump air in and then pump it back out with anything else that happens to be there. At hand speeds it ain't gonna happen. Get that air moving along with your worries.
As an aside, why was the engine sitting on the floor out of a bike in the 1st place. If it came out of a wreck, fine. if the bike wasn't wrecked then there is already another problem more serious than a bit of foreign debris
Ken/Sooke.

[xj11yamaha]

the bike was stolen wrecked then recovered then parted out, quite the life this bike had,anyways i'll try it but i hope nothing happens to it ( nothing probably will except that the sand will be blown out but thats just me worrying again like i do about everything! ) thanks for the help!!!