1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

[Theoutdoorsman]

So far as I can tell I'm looking at purchasing or paying for:


1: Reboring possibly 1 hole and honing the other 3
2: New thermostat kit
3: New head
4: New powerhead seal kit
5: (2) new pistons
6: All new rings
7: New impeller
8: Powerhead to exhaust housing gasket (not sure IF this is included in the seal kit?)



It appears that the top carberator was running on the lean side. The top two pistons are toast !!! Both rings broke in one of the pistons and chewed the head up pretty bad on that side. Hence the need to replace a head. On the other side of the motor, the inner most piston ring is stuck inside the ring groove of the piston and has some carbon build-up on it in the area where this ring is actually stuck. The carbs have been rebuilt, but have been sitting since Febuary. Not sure if I should rebuild them again or not. What would you guys/gals recommend I do with them? While tending to the carbs in Feb., I also installed a 3 psi electric fuel pump in the boat to eliminate the need for priming the ball. I have also installed a new water seperator as well as new fuel lines from the fuel cell to the motor. Is there anything else, in the way of preventative maintanence, that anyone would highly recommend I take care of now? What are some helpful pointers, as to additional preventative maintanence, which might help me to prevent powerhead failure in the future? I've been reading a lot about this decarbing process. Just for future reference, how often should this be done? It's absolutely great to know I have a motor that will STILL get me back to the ramp even if it's kicking on only two and half legs!!! Someone here had told me before that these v4's are beasts. Now I know what they meant by it!! Thanks a bunch.............ALAN

P.S...... If anyone knows of an easy way to remove carbon build-up from within the exhaust chamber of the block, please share it with me........ LOL ......... I'll be dropping it off for reboring/honing first thing tomorrow morning.

 

[Theoutdoorsman]

Re: 1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

Oh yeah, if anyone can tell me what size this piston is, I sure would appreciate it. Just curious as to where I stand before taking it to the shop in the morning. It isn't listed in my parts manual, but here's the numbers I see on it............

OMC 322969 470-99


Thanks again..............ALAN

 

[emdsapmgr]

Re: 1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

To reduce carbon buildup in the crossflows, it is good to use engine tuner every 100 hours, or once a season. Some use the carbon guard additive in each tank of fuel. You can get the same effect by switching to the XD50 oil-it has the carbon guard already mixed in it.

 

[Theoutdoorsman]

Re: 1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

XD50 oil? Is this available at your local Wally World or is this something I'll need to find at the dealer. Brand?Thanks for the info.

 

[wilde1j]

Re: 1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

XD50 is a BRP oil found at dealers for sure.

 

[wileecoyote985]

Re: 1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

Alan;
Can't help you with the piston size.

The shop technician is probably going to want the new pistons to accompany the cylinder block to their location so they can do an actual measurement before they proceed with the bore job. If they aren't supplying the parts they'll measure the bores and any scoring and tell you what to order (i.e. .030 over, etc. ) Once you get the new pistons, they'll measure them and then do your bore job. At least that's the way It's gone for me in the past.

Gary

Oh yeah, if anyone can tell me what size this piston is, I sure would appreciate it. Just curious as to where I stand before taking it to the shop in the morning. It isn't listed in my parts manual, but here's the numbers I see on it............

OMC 322969 470-99


Thanks again..............ALAN

 

[funpilot]

Re: 1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

I let the machine shop order the pistons. They were very familiar with Wiseco, and machined accordingly, and then ordered the pistons. By going .020, I still have room for a possible problem as .030 is the max overbore. Don't forget to check ring gap when installing the new pistons/rings. I found on the two cylinders which only needed to be honed the ring gap was fine. On the two which required .020 overbore, I had to file the rings a bit to get the required end gap when installed.

fp

 

[KYHunter2]

Re: 1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

You may know this allready . But if not , when running wiseco pistons . You need to be sure to warm up your engine properly .

The wiseco pistons expand more then the oem , thats where the warm up comes in.

This is what I've been told by the machine shop that does my work.

KYHunter

 

[funpilot]

Re: 1979 Evinrude 140 is finally cracked open for repairs. Here's the lowdown !!

Thanks for that tip KY, I've always been pretty careful of warm-up, but I'll be extra vigilant from here on.

fp