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1980. AMF 181 Has 1987 140 VOR Johnson on it just blew it up😡HELP

So I'm looking for info about putting a 175 Suzuki 4stroke on it and if that's enough motor the 140 went 36 mph trimmed out looking for a little more speed and quicker planing ,also can the boat handle it??

Thanks

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Curious if the manufacturer's plate is still on the boat and what was the listed max horsepower?

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Hopefully someone else can add to this, but I think max is either 200 or 225. You should be fine with the 175. Check the weight difference between the 140 and 175 as the additional weight could be an issue. You may have to shift the batteries forward to compensate for the additional weight.

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It's rated for 165hp. Look in the general section, under brochure/specification. Going over may cause issues as far as insurance.

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Thanks for catching that one, Bob!

 

I wonder if he contacted the insurance company and explained what his intentions were, would they possibly give him approval due to how things have changed with engine weight when comparing what was available in 1980 versus now? Just a thought....

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Nothing like keeping it simple.

 

On the current motor, did it just seize a piston when the oiler quit working? Can you provide info on the damage? Once the heads are removed and the cylinders inspected, any reputable marina should be able to provide a good estimate on getting it back on the water.

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A bag got stuck on lower unit Cooked motor two cylinders only have 60 lb compression other side like 70 lb so I'm getting a remanufactured PH. Then good to go thanks for ur interest

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Betcha you have a warped head due to the over-heat condition. Did the engine seize up initially, then you were able to restart after a few minutes? Did the spark plugs look real clean...like they had been steam cleaned? That would indicate water getting in the cylinder due to either warped head or burned head gasket.

 

If you still have the motor, remove the heads and see if the gaskets look like they were compromised between the water jacket and cylinder. You can also run a metal ruler across the face of the head and look at it from the side...if warped, you will see daylight in the middle of the head. If not warped much, you can either take it to a machine shop and have them true it up or you can do it yourself on a table saw using lapping compound. (Done this a few times on an old 150 Evinrude 2 stroker, once after running through a grass bed in Albemarle Sound, another time when trash blocked the water pickup).

 

Since the heads are off, rotate the motor by hand and look in each cylinder for any indication of metal smears on the cylinder walls. Sometimes you get lucky if the motor did not sieze, but still good idea to check for any scoring on the cylinder walls.

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