1960 Envirude 10hp no power

[mdgpl]

Bought an old Seaking boat with this 10hp on it. It turned over and fired, but gas spewed out everywhere around the carb bowl gasket. I got a carb kit, tore it down today, cleaned everything, and put it back together with new seals, float and valve. I took out the low and high needle valves (they looked good), cleaned and used some air to blow out all the passages. Put it back together, and after a few setting adjustments, got it to run smooth again in the drive on the water hose.

So, since it its still above 30 here in MN, I went out for a test run at sunset. Two suprises, no reverse (forward and neutral are fine), but the bigger problem was no power to speak of. I adjusted the idle and power needles for the best performance, but still nothing. Only could get to about 1/4 RPM under load compared to neutral WOT.

I thought I'd try some new plugs. Any other suggestions?

 

[backyard mechanic]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Did you check compression? It would be hard to think it would idle "good" with poor compression but then the variables of a bad head gasket are still there.

Besides that- could be your reeds are shot if it shot gas all over from the carbs.

 

[mdgpl]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

I'll check compression next. Thought I pick up a fresh set of plugs too. I hope its not the reeds, seems like that would be a pain.

Anyone have link to a service manaul for these old Evinrudes?

 

[Will Bark]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Go to www.outboardbooks.com/ this is the Ken Cook Company; should have your manual but it will be pricey.

 

[samo_ott]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Did you check the coils? It's probably running on one cylinder. Do a spark test with a proper tester.

And I have the parts manual if you want it, if yes, send me a PM with your request and your email.

 

[steelespike]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Factory reprints are available here at iboats as well.
As suggested both coils are probably suspect.A weak point;readily available.

 

[bktheking]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

When you did the carb kit did you remember the boss gasket that goes over the end of the nozzle?

Spark would be the other guess.

 

[mdgpl]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

I checked spark tonight with an in-line spark tester. Both lit the light bright when pulling the cord.

I tried to check compression, but I need an elbow in order to measure the bottom cylinder. The top one read about 74psi, its new plug was all grey with oil residue (shouldn't it be in the 120psi range?). The bottom cylinder, which I could not measure plug looked like it was new out the box, so I assumed it was firing.

The "boss" gasket. About that thing. The one that came in the kit was a creme colored hard rubber washer, seemed too thick to compress. The one I removed was nearly disintegrated. So, I assumed, probably incorrectly that, one of the black o-rings was intended for that purpose. I haven't thought about it much, but if that gasket is leaking, wouldn't it tend to flood out the engine?

I'll get an elbow for the other cyclinder compression test tomorrow.

 

[samo_ott]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

I've never found an engine that I needed an elbow for to get to the lower cylinder. Are you sure you need one? Do you have an extension on yours that unscrews? That's what mine does.

And if you're talking about the round O ring that goes between the two halves of the carb, yes it's big and if it's not there you'll flood.

I have the parts manual for that engine if you want it, Pm me.

 

[mdgpl]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Tonight I got another chance to check compression on the lower cylinder. My testor has a 1/4 pipe fitting and then 3 different adaptors to that screw on to that to provide different spark-plug thread match-ups. So, after I insert the adapter, there is no room left to screw in the mail pipe thread. Anyway, I picked up a 1/4 pipe thread street elbow and that fixed that problem.

I don't think what I found though was good news. The compression of the lower cylinder is about 60 psi. The top one was 74 psi. You'd think they would be much closer. Nobody ever answered about 74 psi being low or not, but it runs on that cylinder just fine.

So I guess I either have 1) spark, but to low. 2) bad head gasket, cheap and quick to fix. 3) burnt rings / worn out cycliner, a little more work.

What number would you attempt to resolve first? If I go for #1, is it best to just do new coils, points, and condensors on both and just be done with it for 20 more years? Any advice about #3?

 

[samo_ott]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

That is low. I like my engines to be 80#'s at least. But if you get it running and then decarb it, there's a reasonable chance that the #'s will come up. Still weird you need an elbow for the lower plug.

It would be slightly risky to put an all new ignition system on it when the #'s are that low but if you want to take a chance you might get the #'s up once running.

And idea how long since it last ran?

 

[lindy46]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Soak the cylinders in Seafoam. Sit the motor with the plugs pointing up, remove plugs and pour a little seafoam in. Let set a few days and check compression again.

 

[mdgpl]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

I think it sat for about 10+ years. The boat it was on was last titled in 1999.

Lindy46, thanks. The seafoam idea sound perfect.

I'm thinking that I should move the flywheel until both cylinders are at mid point. I'm guessing your theory is that rings might not be moving and if the seafoam creaps in for 2-3 days they might loosen up?

 

[eavega]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

74 is not really that low for that motor. I had a 1960 10 HP Johnson that only read 60#, and it would start on the second pull no problems. Compression testers and testing methods can vary and will affect your readings. More important is that the readings are within 10% of each other, and that's not the case for you. You might want to try that decarb with that sea foam after you have sorted out the carbs. Also, I believe the procedure for testing compression is to do it on a warmed-up engine. If things haven't warmed up and expanded, you may have erroneous readings.

Just a few thoughts.

Rgds

 

[samo_ott]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

I agree compression gauges differ. The last time I used mine I dropped it on the concrete floor just after I had used it. After cursing some, I retested the same 2 cylinders I had just done and they were both exactly 10# higher

 

[mdgpl]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

After 2 days of seafoam in the cylinders, no change. Bottom cylinder is around 60#, top one 70-74#. I didn't start it, but tomorrow, I thought I'd try to run it on one plug wire, first the top cylinder, then the bottom just to confirm that the bottom one does not fire.

What does everyone use to check that spark will jump a 1/4" gap? Purchased or home-built?

 

[kfa4303]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Best to buy an in-line spark tester. They're about $5-$6 at any auto parts store.

 

[mr 88]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Lisle 50850 is a adjustable spark tester with alligator clip on one end. Check Napa,Auto Zone etc, probably 5 to 8$. How big is this boat, beam etc. and how much weight do you have in it.Did you ask the PO if it got up on a plane or was it a troller.No sea trial ? Maybe it is just under powered or he threw the motor on it just to sell it?

 

[mdgpl]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

The boat was empty (Just me at 255 lbs :redface a lifejack, a paddle, and 3 gals of gas. Its a 14' aluminum boat, closed bow, steers from the front w/ remote controls.

I have an in-line neon tester. It "blinks" on both wires. I'm just wondering if its really enough spark?

Previous owner had not ran the boat in 10+ years. The owner did say that it used to plane out with two adults sitting up front, but keep the weight forward. I bought as is. I wanted the hull, if the motor can be brought back to life, that's a bonus.

 

[mdgpl]

Re: 1961 Envirude 10hp no power

Re: 1961 Envirude 10hp no power

Got a spark gap tool today and could not get much more than 30-40 1/1000s gap before i had not spark on top cyclinder lead, nothing on the bottom. Pulled the flywheel, and this is what I got; one coil cracked real bad, one replaced at some point.

Could have guessed it, right? I think I will go ahead and just replace it all; both coils, condensors, points, and cables to the plugs. The newer coil must be weak since I could not get it to even jump a 1/8 gap. Hopefully I don't have to wait too long for parts, and useable days for an in-water test are limited this time of year in MN. Current temp is 36F degrees.