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Hi, I have rebuild my 1996 V6 200HP 2-storke engine (new crankshaft) and cannot get the Oil pump drive shaft installed. Is there an installation sequence (1st Oil pump drive shaft installation, then 2nd crankshaft?) or are there differences between the gear on the cranshaft (i have installed a 2nd hand crankshaft). Hope any one can help me(and avoid that I have to demount the engine again).
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what is the exact model and serial number on your motor? -
Yamaha 2-stroke 200 HP 200 GETO L 500430 X 61H (EU modelcode)Comment
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Sorry I can't find any information about this particular engine. Hopefully Rodbolt or Boscoe may chime in an have something to ad.
Did you not try to mesh the oil pump drive shaft with the crank before you put the crank case back together?Comment
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Piston rod bolts not re-useable.Comment
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Boscoe I mentioned this once before about rod bolts or crankshat bolts that have been torqued should not be reused as they will not torque the same after stess of torque. No one seemed to respond to that. In an automotive or racing application they would never be reused.Dennis
Keep life simple, eat, sleep, fish, repeat!Comment
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Yamaha does not agree. With respect to the OP's motor that is. Regarding the connecting rod bolts and nuts.Originally posted by dray0151 View Post
Some Yamaha outboard motors allow for connecting rod bolts to be reused. Some do not. Same with other fasteners. SHO and Offshore head bolts are reusable. SHO flywheel attach bolts are not reusable. SHO and Offshore crankshaft bolts are reusable. Con rod bolts are not.
I suspect it depends upon the degree to which a fastener is stretched during its installation. Steel bolts are elastic, within limits. Stay under the limit and they can generally be reused. Stretch them to the point that the metal yields (torque to yield) and generally they are not designed to be reused.
It is all up to the engineers. Only they know the mechanical properties of the fasteners that they determine are to be used for a particular application, and whether the fastener is suitable for reuse.
Now if someone wants to scrap a bolt that Yamaha says is reusable then Yamaha will certainly have no objection. It helps their sales figures. They might not give a rats ass if someone wants to reuse a fastener that they say should be replaced. Helps their block sales if and when a fastener lets go.Last edited by boscoe99; 09-16-2017, 09:25 PM.Comment
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I guess for the few dollars cost of the bolts in an outboard and especially in a automotive racing application where an engine, and this was back in the 80's a 6 or 7 thousand dollar block was not worth losing over 100 dollars of bolts.
IMHO I would always replace crank, rid and head bolts. Just me though. Engineers aren't always right and design some really silly stuff like active fuel management in cars today that they plan on using oil. That's why 8 to 8.5 quarts of oil is used in some motors. No engine should have an acceptable use of a quart of oil in 2000 miles IMO.Dennis
Keep life simple, eat, sleep, fish, repeat!Comment
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Dennis
Keep life simple, eat, sleep, fish, repeat!Comment
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Comes down to cost versus benefit doesn't it? Many share your opinion and will change many fasteners that the manufacturer does not recommend changing. Erring on the side of caution.Originally posted by dray0151 View Post
Oil usage depends upon the type of motor and the application. Many Yamaha outboard motors don't use oil, they make oil.
Now take the case of a piston engine aircraft motor. A quart of oil being consumed in as few as 4 hours of flight time is not considered to be unreasonable. Four hours at 150 MPH is but 600 miles. Granted an airplane motor runs a lot hotter and has looser clearances than an automobile motor.
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In my business certain very expensive bolts are reused regularly BUT they are closely inspected, NDT, and measured for length. If they are still within the stretch limits they can be reused.
Yamaha says reuse them...then reuse. If they say toss them and use new then do that. Pretty simple.
In racing situations these bolts are under much more stress than a standard outboard...so replacement is probably prudent. But we have to compare apples to apples...Yamaha engines for the average consumer is not a race engine.
Is anybody going to try and help the OP solve his problem? ?Comment
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over the years I have snapped a few used rodbolts. I wont reuse them any more.
that is just me.
some rodbolts Yamaha says NEVER reuse on final assy.
on this two stroke you assemble the block THEN insert the oil pump driveshaft.Comment
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To the OP: demount and disassemble engine, make sure you have all correct parts, assemble engine using new rod bolts, mount engine and LU, start on premix. I think we helped OP a lot, more than he deserved since he disappeared from forum.Comment
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Issue solved: The oilpump shaft gear on the crankchaft differs between the 2 crankshafts. It looks one is turning right, the other one is turning left. I kept the original set together and now it all fits.Comment
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