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#1
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Stuck Powerhead
Anyone have any tips to remove a stuck powerhead. I have a 1990 V20
with a Yahmaha 225 EXTD engine. I broke about half of the bolts trying to remove them(without breaking). Now the powerhead is stuck. I tried heat and beat, CRC, WD40, PB blaster. Had a hoist hooked up to the point of the boat coming off the trailer. The motor runs fine but the water tube from the lower unit to the power head broke in half. Boat is in pretty good shape. 
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#2
09-15-2020, 08:14 AM
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I ve never pulled the block on a Yamaha, so, Not real sure what s stuck. Mercs have long studs that actually hold the power head to the midsection. Normally heat is the key, but be careful, aluminum and heat is tricky.
Pics would be helpful
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#4
01-30-2021, 08:58 PM
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Pulled many ! replacing the shift shaft I presume?
Don't know if you've already done this but If your good with drilling and filling Drill in from the side about a half to three quarters of an inch down from the powerhead thru each broken/seized head bolt hook your lift to the motor ( I use a fork truck with engine on the boat) Lift to put good tension on it then tap the back of the lower unit with at 4x6 block and a few whacks and they pop. I haven't had one not release. Now you have a 3/8 -1/2 in of the bolt to grab onto and will come right out with visegrips. Now the the headbolts frozen into the mid section - Same strategy drill one hole about the center of the headbolt in the mid section. Hit with blaster or whatever you use, then you tap / HAMMER top and bottom of the of the head bolt for movement. One end might be free. Frozen pieces I then drill at 1 inch intervals and some times your drilling them out from the top and bottom. Filling the Swiss Cheese mid section couple cans of parts cleaner and wash holes good Fill all the the holes with JB Weld Steel Stik then re drill the holes when cured Yamaha put these motors together dry, no lube/anti seize on bolts Did these 1990's 150's on my grady one in 2014 the other in 2018 These older carb'd Yami's are bulletproof. "A carb'd yami wont leave you stranded" grady motors.jpg IMG_2528.jpg Last edited by Dana A; 01-30-2021 at 09:15 PM.
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