Topic: 1961 40hp Evinrude difficult to turn under compression – Page 2

This topic has 26 replies, 9 voices, and was last updated 1 year, 8 months ago by pinka.

Viewing 10 posts - 11 through 20 (of 27 total)

← 1 2 3 →

Author

Posts
April 25, 2023 at 5:22 pm #275600
pinka
I am just surprised the starter it having as much trouble turning it as well. I guess I should open it up and see what it looks like inside.
April 25, 2023 at 5:27 pm #275602
dave-bernard
Participant
US Member
The starter may need rebuilding and just weak. a good cleaning and lube may do the trick.
April 25, 2023 at 5:54 pm #275603
pinka
@Jeff About the cam. I did notice that I didn’t have one. I did see it in the online diagrams. I also don’t have a hole in the shaft for the pin seen in those same diagrams. The part of the shaft that the magneto sits around is “cam shaped” and opens and closes the points fine. When I look at the ’62 model year for this engine they don’t have a separate cam or a pin.

Ah, and when I look at the ’62 cylinder head diagram it doesn’t have the relief vales either! The model number places it as 1961 but the parts seem to be more like the 1962. Hmm.

I will take a look at the starter. After that, the power head is the last thing I haven’t opened. 🙂
April 25, 2023 at 6:34 pm #275604
Monte NZ
Participant
International Member
Looking at the motor makes me wonder if the cylinder head is off a later model…….interesting to note that the paint is still the same colour.
April 25, 2023 at 6:56 pm #275605
frankr
Participant
US MEMBER PAY BY CHECK
Yeah, throughout this conversation, I have been wondering whether or not you actually have a 1961 or a 1962. It would appear you have a 1962, and all this discussion about relief valves was in vain. As already pointed out, there were a number of changes for 1962, a different crankshaft, flywheel, cylinder head, no relief valves and more. but I still don’t think your motor has a compression problem.

Methinks your motor may have had some ID tag numbers messed with by somebody.
April 25, 2023 at 7:04 pm #275606
frankr
Participant
US MEMBER PAY BY CHECK
Yeah, throughout this conversation, I have been wondering whether or not you actually have a 1961 or a 1962. It would appear you have a 1962, and all this discussion about relief valves was in vain. As already pointed out, there were a number of changes for 1962, a different crankshaft, flywheel, cylinder head, no relief valves and more. but I still don’t think your motor has a compression problem.

Methinks your motor may have had some ID tag numbers messed with by somebody.
April 25, 2023 at 10:06 pm #275617
bobw
Participant
US Member
Frank has pretty well nailed it. That motor is a beast to pull over by hand especially mounted on a stand like that. Check your starter, battery condition and all associated wiring to be sure you have clean connections. Starter might just need a good cleaning.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
April 25, 2023 at 11:51 pm #275618
pinka
The model and serial number are on the mounted to the swivel bracket so my guess is the power head was swapped out at some point. Given what I have read about the 60-61 drive shafts coming apart, I am glad to have the beefier ’62 style power head.

I got the flywheel back off and adjusted the coil that was rubbing. I also got the wobble out of the magneto plate using the denting technique I saw in some other threads. I appreciate the help. I have already discovered a lot about my engine from this forum.

I will tackle the starter next. I hope to see this puppy out on the water this summer.
April 26, 2023 at 12:21 pm #275627
Mumbles
Participant
Something doesn’t look right in your first photo as there is no compression relief at all on that cylinder head. The only thing I see is the hole on the rewind starter for the pivot pin for the valve linkage. Either the head has been changed over or the whole powerhead has been replaced at one time.

Look on the block for a welch plug with some numbers stamped on it. It’s about the size of a quarter and might be on the top of the block. The numbers should match the ID plates numbers which is mounted either on the front or the sides of the transom clamps.
April 26, 2023 at 12:58 pm #275630
fleetwin
Participant
US Member - 2 Years
Yes, don’t think this 1961 model used the compression relief feature, doesn’t look like it is there on the cylinder head. Pulling it over high on that rolling stand is near impossible. Perhaps your electric starter is weak, bad/undersize battery cables, or weak battery.
Author

Posts