Identifying early V4 power head?

[reelfishin]

I found a used V4 power head today, it's most likely early 70's.
Instead of having individual coils, the plug wires all come from beneath the flywheel? Can this be converted to use on a slightly newer motor?
It has near perfect compression with all cylinders being in the 145 psi range.
It's complete with carbs, starter etc but has some wiring damage. I was told that it was a fresh factory reman power head that caught fire on first start up. It's not burnt bad, just a few singed wires, it didn't even smoke the paint up.
The parts that came with it were green, but not electric shift.

 

[tashasdaddy]

Re: Identifying early V4 power head?

do you have any idea of the years of the motors. shaft splines have to be the same. mounts, water lines. etc.

 

[emdsapmgr]

Re: Identifying early V4 power head?

You may find that this model does not have the 4 cast mounting posts under the flywheel for mounting the newer stators. You may be stuck using the existing ignition system. Also, check the shift linkages under the bottom carb for compatibility with your lower unit shift shaft. Also, check the block powerhead mounting gasket with later models for matchup with the cooling system.

 

[Chinewalker]

Re: Identifying early V4 power head?

If the crankshaft splines are the same (early ones with electric shift used a 4-sided spline, later used a fine spline) and the base gasket pattern matches, everything else should be able to be converted with a little work. I think you can replace upper end cap with later ones if necessary to accomodate later style trigger and stator. If the shift linkages are different you may be able to swap out the earlier style intake manifold with the later style. I have upper end caps and intake manifolds if you need one - yours for cost of shipping.

- Scott

 

[reelfishin]

Re: Identifying early V4 power head?

The crank shaft is not splined, it's a square female hole on the motor. No Splines.
The lower unit that it came from was not electric shift? it had the same linkage as on my 1976 135.
The block looks the same as the 135, the only difference is that the 135 has two mounts bolted to the side of the cylinders and the 115 is without them and has only the rear two bolt on mounts.
The lower unit on the 115 is siezed up and will need all new bearings. It looks like it sat and rusted. The casting looks like new.
What spline should the 1976 135Hp have?
The lower half of the 115 looks more like my 1985 70 HP, while the 135 looks more like the 150 V6 motor I have here for parts.

I don't care which ignition I end up with, but I'd like to make something usable out of what I have here. Otherwise I'll put it all aside until I find another parts motor.

 

[Chinewalker]

Re: Identifying early V4 power head?

The 135 will have the fine splines. I am not sure where the change-over was as to the splines. I recently parted out a 1976 85 and 135 and both were fine splines. Also parted out a 1972 85hp elecric shift and it was 4-sided like yours. The change-over to hydro-mechanical shift was between 1972 and 1973 model years. Not sure if the crankshafts followed suit for the same years...

- Scott

 

[reelfishin]

Re: Identifying early V4 power head?

Can I use a later crank in an earlier block? Or is the entire power head different? The 115 is a fresh rebuild and I have a spare later style crank from a 135.
If not, will I have to find a good early mid and lower to use this power head on?