Question for the OMC God!!

macojoe

macojoe

Administrator
You know that 1988 175hp Evinrude my budy had I was working on, well he wants to repower and has offered me the motor.

The motor runs great now that I have got all the bugs out of it for him!!

He is running it on a 20' Grady walk around.

Now here is the thing, one of the problems we had was that when you got it on the water it would run then start to surg, no gas then have gas and so on, it would start real hard if we shut it down??

This would go on for a bit then she smooth out and be fine the rest of the day!! I mean start like a light switch, and sound great while it moved us 35 mph+

Then one day out with another friend it started again, he had noticed that there was a clamp missing on the fuel line, we replaced and ran great the whole day.

Now when you start her up and take off you get a small and I mean small surge were it wants to take off, this will just be a few times with in let say 1/2 mile then never agaim the whole day.

ReAlly sounds great, and pushes great, just this worries me a bit??

Have you heard of anything like this before?? I can get the motor for $700 maybe a bit less??

what you think?? I will try to get some pic tomorrow
 
It could be many things, The first question that comes to mind would be; Is the fuel bulb equally as firm while it is misbehaving as it normally is? This might answer some questions about fuel delivery.
From there I would ask about the temp. when the problems start? If that had any relationship to the problem?
 
Well the ball stays almost hard, can squeez a little.

Temp is not the problem!! this is when you first start of the day, use to be anytime till we got the clamps on??

Pumps water and the heads are nothing but warm after a 7 mile run.

Thanks!
 
i know exactly what you've got had the same problem and pulled out lots of hair till i found out i had a bad electronics pack. Motor would run great some days run crappy and loaf the next. hard to start some days and crank on a turn the next. Now as to which one is bad can't help ya there i say buy one pack then try on one bank see if problems goes away if not put the old set on the other side and try again.
 
that is the power pack you are talking about??

I have seen them on ebay for like $50

but the motor sounds real good!! CB has heard it and says the same.

Think its worth $700??

What should the compresion be like in that motor??

Thanks!
 
factory was around 120 psi and $700 is agreat buy. But just because it sounds good doesn't mean it is running at the best it can. yeah power pack will be the issue. that is a need to fix issue due to it will end up burning a piston or cylinder.
 
I dunno. From what I heard, it sounded more like the motor was cutting out momentarily rather than surging. I still think it's a fuel related problem. But, I've been wrong once or twice in the past. Skools is definately more "skooled" than me in this area. That's for sure.
Skools; from what I heard, it seems to cut out momentarily only for a short time after iniatial startup for the day. Once it clears up, it didn't seem to happen again all day. Could a bad diaphragm in the fuel pump cause intermittent problems if it were getting aged a bit. I can imagine that upon startup, the diaphragm may be not so flexible. Then after running a bit more, start working more effectively. Is that even possible? I know I'm probably reaching a bit here. It just didn't seem to be electrical to me.
Like I said; I dunno. ???

It certainly does seem to run like a champ once it clears up though. Sounds good. Plenty of torque. I think it would make a good motor for MJ if he can get it for the $700.
 
could be lots of things.stator, old fuel hose, reed, ring... does it 'chirp' at idle? have you looked at the magnets? more than likely hte cdbox like like skoolz said. them things are funny. sometime they run fine till they get warm. sometimes its the opposite. sometimes they just screw with ur mind for fun! i wouldnt buy a used one though. or a sierra for that matter. diaphrams are also cheap. but, for 700 bucks its hard to go wrong. good luck.
 
Will the coils from my old 1985 140 hp be the same as the ones on this motor? If so I could send him a couple to try instaed of buying one.
 
Good luck w/ that '88, MJ...my '86 Rude was a great runnin' motor...lots of years of service from 'er...

Have you diconnected the VRO?...unless you've gone thru every component of the auto-oilin' system, I wouldn't trust it...mixin's a piece-of-cake w/ one of those Accu-Mix bottles...$3.99 most boat dealers...Wally-Market may have 'em...works good even in boats w/ multiple tanks... ;) ...
 
Posted by: reelapeelin Posted on: Today at 6:13am
Good luck w/ that '88, MJ...my '86 Rude was a great runnin' motor...lots of years of service from 'er...

Have you diconnected the VRO?...
Click to expand...

Yes the VRO is disconnect!! I have been around motors long anough to kow that all VRO's sholud be disabled!!

Posted by: shicks007 Posted on: Today at 6:03am
Will the coils from my old 1985 140 hp be the same as the ones on this motor? If so I could send him a couple to try instaed of buying one.
Click to expand...

We will have to see what the master says! I am not sure they will fit or not??
Well I could do a parts search and see? Do you know the part # should be on the side of the power pack?

Thanks for th offer!!

For $700 I should not be expecting gold!! But I want something to last a couple of seasons at least?? Then maybe I be in a better place then I am now!

I got $800 for the last junker, and I will tell you it ha not been easy to hold on to it!

Thanks all!
 
Another vote for the power pack. I had a similar problem with poor running, surging on our old 155 -- and a new power pack took care of it. Ran like a champ after that.
 
Shick, I just did a parts search and I belive I have the:

OMC 583114

Then I searched for yours, the funny thing is I could not find a 85 140??

But they had
1977 140 OMC 581731
78 to 83, 140 OMC 582125
88 to 99, 140 OMC 584041

Thanks for the offer!! :-*
 
coil wise both motors use same coil.
OMC part # 0582508

The power pack on the 175 is as follows
OMC part # 0583114

fit's 1986 to 1988 150's and 175's
 
MJ, the power packs on my '86 Rude were good when it went down...now that was 2 yrs ago, but if ya WANT me to, I'll check w/ Holdens and see what he wants for 'em if he's still got 'em... :D ...
 
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