3 hp evinrude lightwin

[vpedpa]

Just rebulit powerhead of my dads 3 hp lightwin. new rings, everything else looked good. Reassembled, very difficult to turn motor. Where did I go wrong. Just seems too tight. Anyone??

 

[tx1961whaler]

Re: 3 hp evinrude lightwin

Well, with new rings and possibly a new water pump impeller, it will be pretty tight. How easy is it to rotate with the spark plugs out?

 

[bktheking]

Re: 3 hp evinrude lightwin

Just rebulit powerhead of my dads 3 hp lightwin. new rings, everything else looked good. Reassembled, very difficult to turn motor. Where did I go wrong. Just seems too tight. Anyone??

Did you have the recoil apart?

 

[F_R]

Re: 3 hp evinrude lightwin

Did you have the recoil apart?

Do you have the connecting rod caps on the same rods they came off of?? Do you have the rod caps oriented correctly end for end (not backwards)?? Did you use an inch/pound torque wrench to tighten the rod cap screws and use NEW lockplates?? Did you tap the tapered dowel pins in first, THEN install and tighten the bolts?? Did you use an inch/pound torque wrench to tighten the bolts to the correct tightness?? Did you slop on too much sealer between the case halves and it got squeezed out into the bearings?

More to this mechanic-ing job than meets the eye, huh?

 

[1946Zephyr]

Re: 3 hp evinrude lightwin

Do you have the connecting rod caps on the same rods they came off of?? Do you have the rod caps oriented correctly end for end (not backwards)?? Did you use an inch/pound torque wrench to tighten the rod cap screws and use NEW lockplates?? Did you tap the tapered dowel pins in first, THEN install and tighten the bolts?? Did you use an inch/pound torque wrench to tighten the bolts to the correct tightness?? Did you slop on too much sealer between the case halves and it got squeezed out into the bearings?

More to this mechanic-ing job than meets the eye, huh?

Oh my God Frank.....you're scarin the young man...

 

[vpedpa]

Re: 3 hp evinrude lightwin

thanks for all the ideas.
i completely disassembled powerhead. including rod caps. Things looked good.
reassembled. Torqued with inch/lb per specs. still tight, nearly impossible to turn prop by hand. Removed new impeller. This time applied oil. Better, much better. Adjusted coil, seemed to be impinging on flywheel. now completely free. Ill try to start it tomorrow. What is the right fuel mixture, oil per gallon of 87 octane.

 

[bktheking]

Re: 3 hp evinrude lightwin

thanks for all the ideas.
i completely disassembled powerhead. including rod caps. Things looked good.
reassembled. Torqued with inch/lb per specs. still tight, nearly impossible to turn prop by hand. Removed new impeller. This time applied oil. Better, much better. Adjusted coil, seemed to be impinging on flywheel. now completely free. Ill try to start it tomorrow. What is the right fuel mixture, oil per gallon of 87 octane.

Ya never thought of that, dragging on the coils.

 

[vpedpa]

Re: 3 hp evinrude lightwin

Yea, but I dont think it was the coils initially. Probably didnt lubricate the impeller properly.

 

[bktheking]

Re: 3 hp evinrude lightwin

Yea, but I dont think it was the coils initially. Probably didnt lubricate the impeller properly.

Shouldn't make it "tight" like you described, doesn't matter now as you fixed her up!

 

[tx1961whaler]

Re: 3 hp evinrude lightwin

The Gas/Oil ratio depends on the year of the motor.

 

[1946Zephyr]

Re: 3 hp evinrude lightwin

All 3hp Light Twins should be mixed 24:1. Eventhough they say 1964 and later motors run on 50:1, the 3hp Light Twins are still the old friction type engine and don't have any needle bearings.

 

[tx1961whaler]

Re: 3 hp evinrude lightwin

I run my late 50's lightwins at about 20:1. They started out as 16:1 motors, back when they ran 30 weight non-detergent motor oil....

 

[kbait]

Re: 3 hp evinrude lightwin

Bet you used a sierra impeller. They're a bit bigger than OEM, and do bind a bit initially. I'm sure oil helped!

 

[1946Zephyr]

Re: 3 hp evinrude lightwin

I run my late 50's lightwins at about 20:1. They started out as 16:1 motors, back when they ran 30 weight non-detergent motor oil....

Yep. Believe it or not,, even the later 4hp's are the same way. Since the motor in this thread has just been rebuilt, It wouldn't be a bad idea to run 16:1 on the first tank.