Turd Polishing

[MrGiggles]

1 hour ago, fishinwrench said:

So the compression loss was caused by what?    Leaky valves?

What are the compression readings NOW?

By this.

I only did a real quick compression test with a half dead battery before starting that yielded 150. It was less than 100 before.

 

[fishinwrench]

So "everything on the engine was NOT beautiful" then !   😅 

Almost looks to have ingested something.   Definite signs of detonation.... but why on the edge on a 4-stroke?     Seems odd to me.....but I'm not a 4S guy. 

Dieseling? 🤷

[MrGiggles]

2 hours ago, fishinwrench said:

So "everything on the engine was NOT beautiful" then !   😅 

Almost looks to have ingested something.   Definite signs of detonation.... but why on the edge on a 4-stroke?     Seems odd to me.....but I'm not a 4S guy. 

Dieseling? 🤷

I thought the same thing, but there was no corresponding damage to the head.

I'm certain preignition/detonation was the cause, but the cause of that is what I'm not sure of. A heavy shot of ethanol will do it for sure, especially since these don't have an 02 sensor or any way to monitor A/F ratios. A car would've run like crap, pegged the fuel trims and set a lean code, but would be undamaged.

One thing that did cross my mind is if it could be related to the FSM issues on these. Any sort of problem there will flood #4, but I haven't had any issues there yet. I looked at replacement fuel pumps and about fainted, good thing there's aftermarket.

[MrGiggles]

Charging issue was just a bad fusible link. Working well now.

The power trim issue has something to do with the trim limit module. It can be taken off since there is nothing for the cowl to crush on my rig if it's trimmed too high.

I did a proper compression test and came up with 175psi on #4. The rest are closer to 190, but it isn't broken in yet.

[snagged in outlet 3]

I can’t wait to see this bad boy run.   Like @rpsI’ve thoroughly enjoyed following along.  Thx!

[MrGiggles]

Maiden voyage went pretty well but wasn't without trouble. 

The low pressure fuel pump doesn't seem to be working right, if at all. Prime it up and it'll go for a while, start losing power, prime it up, rinse and repeat. I'll need to pull the FSM and see if the float switch is working correctly. 

The boat sits probably 2 inches lower in the water, not the best but even if I stand on the transom, the splashwell drain is still above water. 

I got 29mph briefly bouncing off the rev limiter, running the 12P pontoon prop, still waiting for the hub kit that'll fit the 17P 4 blade that I have laying around. Should be about right for this setup.

Pomme gave up a few crappie too, so not a bad trip.

[Ranger520vx]

That’s cool that you finally got it out on the water. Pomme gave up some crappie for me on Friday caught a lot but not a lot of good ones. I was surprised at how off colored the water was.

[MrGiggles]

I pulled the FSM apart, did not really find much, the low pressure pump seems to work just fine and the float is doing what it's supposed to. 

I did find that the high pressure pump seal is not in great shape. I'm going to replace the pumps anyway, 10 years is a pretty good run for EFI pumps, especially in this environment.

I'm also going to do away with the Mercury quick connector on the tank. I had some of the same trouble with the Suzuki, makes me wonder if it's on the boat side.

[Ranger520vx]

A friend of mine had a Optimax that had a high pressure pump seal that looked like that and it wouldn’t even run.

[fishinwrench]

By "low pressure pump" are you referring to the mechanical diaphragm pickup pump.......or does it have one of those insane fuel systems with 2 electric pumps (one inside the VS and one outside the VS) ?