Thread: Thrust Point in 1.8L SC Motor???
03-27-2012, 02:45 PM #1
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- Apr 2008
Thrust Point in 1.8L SC Motor???
I'll try to keep this short...
I've got a SHO motor that we thought cold seized.... But after pulling all 4 pistons out of it, the crank was still extremely hard to turn. So after further investigation, we found that the crank would move front to back about 1/4". The counterweights of the crank actually ate up the aluminum block.
Can someone explain to me what is in that motor that keeps the crank from "thrusting" or moving front to bank in the journals?
Wish I had pics, but the motor is down the shore and I'm in the city till the end of the week.
03-27-2012, 02:53 PM #2
I ran into the same problem when my pump blew out and pushed the crank forward. There is no thrust bearings on these motors, way to go Yamaha!!! You will have to take your block to a machine shop to have trust bearings build and machined into the block, Julio...
03-28-2012, 10:03 PM #3
03-28-2012, 11:58 PM #4
Crank end play spec on any engine of this displacement would be from .005-.010 thou.
03-29-2012, 07:15 AM #5
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