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powerhead removal 1986 150 hp

D

dawgs

Regular Contributor
I have a 1986 evinrude 150 motor that needs a crankshaft. How hard is it to remove the powerhead so I can easily work on it?
 
Re: powerhead removal

The biggest problem is the 6 bolts that are about a foot long that go through the exhaust housing into the bottom of the powerhead. If it is a saltwater engine, they are usually very corroded and nearly impossible to remove. Heating with a torch, C-4 explosives, lots of cussing are all required. The good news is you have no choice--you cannot replace the crankshaft without removing the powerhead. Be sure to put away all of your breaker bars, and all of you 1/2 drive sockets and ratchets. Have a trusted friend hold onto all of your impact tools too. Despite everything you hear, Liquid wrench, PB Blaster and all of the removal aids are totally worthless. Better off buying a 6 pack with the money. Take it slowly, and good luck!
 
Re: powerhead removal 1986150hp

No there are 4 smaller ones near the front and 2 hidden nuts at the back ( horse shaped cowling needs to come off.-------------------------If the long bolts do not come out , then drill thru them from the side at or near the top.
 
Re: powerhead removal 1986150hp

ok. how hard and how bad is it to remove a bolt that the head broke off? are the bolts only threaded into the powerhead? or are they threaded thru the mid-section too?
 
Re: powerhead removal 1986150hp

The long bolts arejust threaded into the block-------------When salt water gets into these things corrosion starts.-----------The white powder is aluminum oxide ! ---------therefor there is now more material there as oxygen has joined up with the aluminum.--------Nature works like that and it jams it up tight.-------------As I said, I have had to drill near the top to cut the bolt.--------Once the powerhead is off you can drive the stud out with a punch.
 
Re: powerhead removal 1986150hp

my problem is this. i was able to get to 4 bolts. couldnt reach the other 2 yet till i flip the motor. 3 came out fine. 1 broke at the bolt head. if i can get the other 2 long bolts out as well as the other bolts and nuts....then that broken bolt shouldnt keep me from removing the powerhead....correct?
 
Re: powerhead removal 1986150hp

It will only be stuck if the bolt is jammed in the bore.--------------1 or 2 of these long bolts are a closer fit for alignment purposes.
 
Re: powerhead removal 1986150hp

racerone. so if i remove all other bolts i should be able to muscle the powerhead off then work on that bolt?
 
Re: powerhead removal 1986150hp

Correct.---------There are also a couple of 1/4" bolts that hold the lower cowling one on each side of the block.-------these never give a problem.-----------Shift rod pin needs to come out too, below bottom carburetors.
 
Re: powerhead removal 1986150hp

so how many total bolts and nuts? i see the 6 long bolts....2 nuts on the rear...2 nuts in front and 2 bolts in front. is that all of them?
 
Re: powerhead removal 1986150hp

That is all on the bottom.-----The two 1/4 bolts ( hold the lower cowling ) are beside the block up top .--The shift connect screw is below bottom carburetor.
 
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