Not the DOG

[kmdfluker]

I?m back

Hope you?re out there High Trim.

Well I pulled the lower unit with high expectations that my shift/clutch DOG was my problem. Not the case. DOG and gear show no signs of wear. I do have some problems with some seals - outer drive and the one under the water pump, but that looks like it.

Can?t figure out what the miss is and the bang I got at high RPMS (4200+) a few times. Not being in the water I don?t know where to go next in preparation for the new season.

The only other thing that comes to mind is I reset my shift rod after doing the water pump and putting a new ?O? ring on the rod. Maybe that was not in the right spot. I did adjust down one turn after the problem started but couldn?t go in reverse so I pulled it back up and adjusted the linkage. No change and had continued misses a bang later in the year.

Maybe I should have backed it out one instead. It was down 7 turns. Could the whole thing be slipping as one unit because of bad position?

The bang is what really bother me. The first time it was very loud and happened 2 other times, but not as bad.

If at all possible do you have any other ideas.


Please se my posts ?KMDFLUKER? to follow my problem.

 

[HighTrim]

Re: Not the DOG

Rather than determining the shift rod height by turns, measure it from the surface of the gearcase to the connector hole, to get an accurate setting. Do you have a manual? If not hopefully someone can jump in with the specs and tolerances. Have you tried re positioning the cables correctly? Do you have any pics of the dog?

 

[ezeke]

Re: Not the DOG

You will find the exact measurement for your shift rod in the last part of the "Gearcase" or "Lower Unit" section of your service manual. The 1996 V6 150HP measurements were 21-1/4" for the long shaft and 26-1/4" for the extra long shaft.

Edit: My Seloc Manual lists three measurements for 1997.

20.0" Shaft.....21-1/4"
22.5" Shaft.....22-3/4"
25.0" Shaft.....26-1/4"

The measurements are not an option; they have to be set correctly - in neutral, measured from the mating edge of the gearcase to the center of the hole at the top of the shaft.

If that is not the problem after all else, check your propeller.

I have attached a picture of one of my high-tech, terribly expensive Mark IV Mod 3 Shift Rod Measuring Tools.

 

[kmdfluker]

Re: Not the DOG

High trim

.no pics

Looked real clean no scuffs chips - all ends had the same very slight round which I was told was normal. Gears all clean with no wear marks. All components were clean no rust. The shaft to the prop had some wear from a washer grinding on it, but other wise no abnormal wear.

I confirmed with my buddy that the bang happened 3 times once real bad like we hit a log in the water the other times not as bad and the engine ran crappy after that. But the miss like a prop slip ? miss fire happened 4 out of every 5 times out. Would this have been enough to damage the DOG?

Also

If the shift rod was not in the right spot - what would have happened? Would I get the same symptoms that I?m getting?


Thanks again for your support and guidance.

 

[HighTrim]

Re: Not the DOG

I think Im getting a little confused, which is easy to do by the way

The sensation of hitting a log, usually due to jumping out of gear, is 1 problem in its own. Are you sure you are not possibly mistaking this for a misfire? Do you feel it is jumping out of gear, then back in?

Firing (backfiring) out the exhaust port can be caused only by having the ignition system fire a particular cylinder when the exhaust port is open (piston down). This would sound like a shotgun going off..... is this the condition that you're experiencing?

This can be caused by a sheared flywheel key, or a flywheel with melted (moved) center sensor magnets if they exist, or having the timer base leads routed incorrectly to the powerpack, or having the leads from the powerpack to the coils reversed to mention a few. Maybe pull the flywheel and inspect the key to rule that out.

I cant see you hearing the symptoms you are describing from a spun prop. That would simply sound like it is "revving" up, when under load.

Starting off by ensuring your shift rod is set to the correct height with the specs provided by Ezeke would probably be a good starting point. Good luck, I hope you get this.

 

[Dhadley]

Re: Not the DOG

Post a pic of the lugs on the dog & gear.

 

[DJ]

Re: Not the DOG

.

as bad and the engine ran crappy after that. .

A slipping DOG should not cause the engine to run bad. I'm also thinking something with the flywheel.