1977 Evinrude 140

[rrumba]

Hello all. trying to gain some knowledge here regarding outboards. i am very familiar with I/Os, stringers, complete teardown and rebuild of engines and transmissions but nothing when it comes to OBs, dumb as a box of rocks

I am picking up a 75 starcraft tomorrow that has a 75 evinrude 140 and i am trying to get some info about the OB. this is what the guy said about the OB

1975 Evinrude 140. Power trim. Motor needs carb cleaned and new cables. ( I think with motor. Say it is bad)

No idea when it ran last either. before i tear into the boat i would like to check the OB and see if it will start and run.

My questions are:
1. What do i need to check / replace or should do before trying to see if it will run?
2. Do not want to put a lot into it right now just to make sure it is running, but will do what is needed.
3. What things do i need to look out for on this year/model OB when I get there tomorrow?
Is this even an OB that is worth having, fixing up of just replacing?

i will be redoing the boat, repaint the OB, change out the impeller if it does have one in the lower unit, rebuild the carbs, tune up etc when i do the resto for the boat.

Any help would be greatly appreciated. Thanks.

 

[emoney]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

I wouldn't do anything until I did this: 1) Compression test. (should be withiin 10% of each other, and over 100lbs each)
2) Spark test. (top thread that says, "Top Secret" has a link to proper spark test)
3) Fuel system inspection (see below*)

*Once you know you've got good compression and spark, you can assume the carbs need at least cleaned, maybe rebuilt. Check the fuel lines all the way from the carbs out to the tank, checking the fuel pump screen and diaphram. Make sure the hoses haven't started flaking. If so, replace them. Drain all the fuel and start with fresh, pre-mix 50:1.

If the compression's no good, then you've got decisions to make like, "Do I want to do a complete tear down/rebuild or buy a new motor".
Good luck and keep us posted.

 

[rrumba]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

ezmoney, thanks for the info. Here are some pics of the outboard. The PO said it last ran at the end of april, i have reservations about that statement though. he also said that it will trim up but after several days it will go back down. are the trim units fairly easy to work on? Are these motors decent, good, garbage? I paln on following your adive before starting. this will not be until next week before i can get to it.

 

[Monte1961]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

Any OB is ok as long as it wasn't built on a Monday or Friday!....LoL. Take ezmoneys advice^ As far as the trim goes, all will leak down after a period of time. If all checks out, and it's worth it to you, then I would say you got a good deal. But with that being said, I don't like to purchase OBs unless there lake tested first.! Good luck and post back results. I would be happier if the compression was at least 110lbs ea, or better. But that's just me!

 

[rrumba]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

following ezmoneys advice is the plan. As soon as i can get to it next week that is the first thing to do. Now the fun part is locating the service manual for the OB. not an easy feat. I am looking for the actual service manual. what year range will work, 1974-1978? I have found several on either side of the 75 but not a 75.

thanks for stopping in and the advice monte

 

[Monte1961]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

Check out ebay, they have lots of manuals on there for different makes and models. Good luck.

 

[pcrussell50]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

that motor is a v4 crossflow... but there was no 140hp in 1975. the top model was the 135hp, in 1975. the 140 didn't begin until 1977. also, take a picture of the valley between the "V" of the cylinders. if it is not a "bubbleback", it is not a 140. it is a 115 or even an 85hp. it's hard to tell for sure in the pics, but i can't see the bubbleback. also, the trim/tilt arrangement looks like a '78 or newer, (i could be wrong about that one though).

-peter

 

[emdsapmgr]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

pcrussell is correct this engine is not what you think it is. The coil bracket is on the top of the block, indicating a 1977 or older ignition system. The power trim system is from a 1977 or later. The cowling has decals for the label "Evinrude 140". The "EVINRUDE 140" labels on the side of the cowling were not decals. They were aluminum appliques which had pins moulded into the back and went thru holes drilled in the cowling, with gromments which held them on inside the cowling. The aluminum appliques started in 1977 with the advent of the 140, all the way thru the last year of 1974. Many of the earlier 135 engines used the same aluminum strip appliques. The cowling configuration is 1978 or earlier. The silver painted lower unit is typical of a 1977 thru 1979 vintage paint job. See picture. As mentioned, it looks like this engine is a lower hp flatback model. Could well be a 1977 flatback 85/115 with a modified cowling. Post the model number from the transom bracket and also the model number from the round casting plug on the very top of the rear of the block. They should match.

 

[ezmobee]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

I came here from your other thread basically to just say that it's not a '75 as it would have been a 135 in that year. The paint job on that cowling is '77. Lots of disparities.

I'll be interested to find out what it is.

 

[emoney]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

If you get a chance, post a shot with the lid removed, it'll help with the identity. Even if it's a 115hp, it's still a good motor, just a little less power on the top and little less torque. May not even notice on a 17' bass boat. Lot's of interchangeable parts on the V4 crossflows. Manuals are available and recommended reading when it comes time to doing the "restore".

 

[rrumba]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

Hey guys, thanks for the tips and information. I have been out of town and never got to trying to start her as i wanted to get a manual first before tearing it up and cleaning the carbs. When i checked on BRP or whatever it was it did not list a 140 for 75 as everyone is stating which is what got me wondering what i did have. I will get some pictures of the tilt/trim and SN, along with the transom bracket and number, some of the motor with the cowling off showing all sides and the numbers from it. thanks for the help and patience with me.

WIll post the pics tomorrow afternoon before i start the grinding on my other project boat.

 

[rrumba]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

Ok, i got some pictures to post. Also, the number on the transom bracket were
Model Number: 140743S
Serial Number: J0001875

I could not find any other numbers on a plate on the actual power head. I did find a set of numbers under the flywheel stamped in. they read:
RSM1761 S and below that was
140 70. i have a picture of that below.

also there is a wiring diagram on the stbd side with no terminal block and on the port side there is a red multi pin connector. should there be a terminal block?

I guess when i can find out what model and year i actually have getting the book will make these questions a moot point. So any help you guys can provide to help identify this "FrankenRude" as EZ stated correctly, would be GREATLY APPRECIATED!

Rear view

Stbd side

Port Side

Numbers under flywheel

Port and rear

Stbd and rear

Thanks for the help guys.

 

[guy74]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

That model number, and everything I can see in the pics is correct for a 1977 140hp.

 

[wilde1j]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

You can double check the Model and sn by looking for a stamped core plug on the top aft part of the powerhead. I don't think the numbers on the bracket mean much. The numbers on the core plug should agree with the data plate on the mounting bracket, unless you have a frankenmotor.

 

[rrumba]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

You can double check the Model and sn by looking for a stamped core plug on the top aft part of the powerhead.

I looked for something like the one emdsapmgr had posted but could not find one. I will look again tomorrow and take a few pictures of the powerhead.

unless you have a frankenmotor.

Ok i have to ask, what is a frankenmotor?

 

[guy74]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

A "frankenmotor" is a motor peiced together with parts of different motors. Like my 1989 100xp, that has the "short block" of a 1987 88hp johnson.

 

[rrumba]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

ahhhh, gotcha. will definitely have to check that then.

 

[89retta]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

I have the same motor and mine is a 77.Wondering if you could tell me what terminals are the wires from the regulator hooked up to.Mine were disconected when i got it.

 

[emdsapmgr]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

That 77 140 is a real find. Rare. It's the only crossflow V4 that was ever made with a tuned exhaust megaphone in the midsection. A real high performance engine....

 

[rrumba]

Re: 1975 Evinrude 140

Re: 1975 Evinrude 140

thanks for the info emdsapmgr. I did not get to taking a picture of the top looking for the number. was busy grinding glass all day. hopefully tomorrow.

89retta, if you are talking abou the terminals on the stbd side, that is part of the problem as i do not even have a terminal strip there, nor do i know if it should have one.

i have ordered the service manual and hope to have it this week.