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1988 Johnson 150 hp v6 replace upper rubber mount assy

Re: 88 Johnson 150v6 replace upper rubber mount assy

Yes, it is necessary to remove the powerhead in order to gain access to that top main motor mount.

If you can grab the back of the engine and move the engine back and forth (not sideways), that would indicate that the top main mount is faulty BUT.............

If the engine does not move straight back and forth as stated above, BUT rather shakes violently sideways, that indicates that the splines on the bottom of the steering bracket (splines that engage the bottom motor mount bracket) have failed either within the bottom mount bracket or the steering bracket (or both).

Let us know what you find.

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Re: 88 Johnson 150v6 replace upper rubber mount assy

Or it could be the BIG nut has loosened up on the bottom end of the pilot shaft.
 
Re: 88 Johnson 150v6 replace upper rubber mount assy

No..... But you do need to remove the lower unit, various wiring, fuel lines, steering linkage, then have the engine supported (hoist, something) and disconnect the top and bottom motor mount retaining bolts, remove the powerhead and long exhaust housing as a unit, then you can remove the nut from the bottom of the steering tube to remove the lower mount retaining housing. At this point you'll find what splines are bad.
 
Re: 88 Johnson 150v6 replace upper rubber mount assy

When you find that the steering shaft is rotted off just above the nut, don't get too excited. A decent used steering bracket assy isn't usually all that expensive, and are fairly plentiful.
 
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