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30 153 4 cyl new crank

R

rehays

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"Hi...
I have an 18ft 88 ba

"Hi...
I have an 18ft 88 bayliner 3.0 merc 153 that started to have a knock in it. I immediately shut it down and pulled the motor, and found a spun bearing. I am working on determining if the crank can be reground, vs just buying a re-man crank, vs purchasing a remanfactured block vs a complete upgrade to a bigger moter and new lower unit, vs a new boat..... I have read many post about tapping / bashing / pressing the sleeve that hold the lower pully back onto the crankshaft as it is not threaded to draw it back on. I used a puller to get it off, (to remove the camshaft/timing cover and seal) Previous posts have talked about fabricating a unit to help press it back on,,, I can't envision this.... no one has posted a pic of what they fabricated to do this that I have seen... Merc manual say to tap it back on to the crank,,,, ie... risk hurting the new bearings,,, any thoughts or ideas on this... I would hate to put the money into it and then hurt the new bearings by 'bashing it back on' and have to re pull it.... some back ground... I have had the boat 4 months... put a rebuilt lower unit on it that is working great,,, re-did all the floors, fixed about everything electrical, it is a good lookin solid boat, and I have about 4k into this project..
thanks for any and all ideas, suggestions and help...."
 
"the 3.0 is a 181, the 2.5 is

"the 3.0 is a 181, the 2.5 is the 153 ..wanna make sure you get the right parts.
3.0 has a vibration dampener on front of crank, 2.5 doesn't"
 
"Thanks for you help... It is

"Thanks for you help... It is the 2.5 Mercrusier, no vibration dampener. It says 153 on the tag on the motor. It was extremly hard pulling that off. Had to use a 5 ton puller and a breaker bar. I can see that putting it back on the crank "tapping it" is going to take a long slow process. Any best practices?
thanks again for your help."
 
In an 18' boat..you might

In an 18' boat..you might want to start looking for a 3.0... that 2.5 is going to be miserable for power. The 3.0 is a bolt in replacement as long as you stay pre-1990 and will give you an extra 20HP.
 
"thank you for your help....

"thank you for your help.... I have started my search. Boat was always underpowered, but I could get about 32 mph out of it with a 15 x 15 prop at 4000 wot. Now that this one went,, it's decision time.."
 
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