1956 7.5 hp evenrude fleetwin

[lith74]

I have has this motor for a little while. I picked it up some one had already started to go through it. There were no coils, pick ups or condensers. I got the whole plate off Ebay for $40. unfortunately the coil covers have cracks, but installed all of the stuff anyways and no spark. I am about to start taking it apart again to measure the resistance in the coils. My main question is how much compression should this engine have? When I checked before, with both plugs removed and a few strokes I had 30 PSI per cylinder dry. Is this sufficient? Do you guys have any other advice for em while I am getting into this? I have been a diesel mechanic for over 20 years, however boat engines are a totally different beast. Thanks in advance.

 

[Chinewalker]

Re: 1956 7.5 hp evenrude fleetwin

Don't bother trying to save the coils. New ones are available right here on iboats 18-5181.

30 psi doesn't sound good. Doesn't sound right, either. Try another gauge and squirt some oil in through the carb. Not a lot, but enough to film everything inside. Should be at least 80 psi in each hole.

 

[HighTrim]

Re: 1956 7.5 hp evenrude fleetwin

As stated above, all original coils are junk, don't waste your time.

I would start first though by determining what is going on with the powerhead before I put money into it. Pull the head and inspect the gasket and mating surfaces. Then inspect the bore of the cylinder.

Let us know what you find.

 

[lith74]

Re: 1956 7.5 hp evenrude fleetwin

Ok, new compression test using my gauge for checking fuel pressure on trucks, oil in carb and I'm getting 30 to 40 PSI per cylinder. I pulled the head off. the bolts were fairly tight, not all took the same amount of force to remove. The head came off with a slight pull. The gasket didn't seem to be damaged and no signs of leaking (atleast from a heavy duty point of view). The cylinder walls are so so. there is no heavy scoring but looks like there was some slight rust and no cross hatches, I paid special attention to the top side of the bore because i assume that that area would have the least amount of lubrication due to gravity. I took off the gasket and it took more effort to remove. I'm assuming that the previous owner took the head off and stuck it back on. I will upload photos in a few minutes. Let me know what you guys think.

 

[lith74]

Re: 1956 7.5 hp evenrude fleetwin

correction, I wont be uploading photos, there doesn't seem to be a link from my phone

 

[Chinewalker]

Re: 1956 7.5 hp evenrude fleetwin

I would pull the intake port cover and check the rings for looseness and springy-ness. Good chance they're carbon stuck... Those compression numbers will not get you a running motor.