1973 18 hp Evinrude starts out running great, but slips out of gear

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Here are the pics that I have been promising.

 

[kfa4303]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Nice. I like the tiger stripe/camo look and the hull looks to be very solid. The electric start is handy too. I run the same basic rig (14' tinny and 20 hp Johnson) and can get it up to 20 mph +/- with just me in the boat. Are you gonna keep it tiller drive, or hook up controls and a console eventually?

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Thanks man! The hull is rock solid and super stable in the water! Now only if I can get the motor tuned properly... I am going to leave it in the tiller configuration. I plan to run jugs out of it when the water ain't frozen and hunt ducks in the winter.

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Hey guys, I have been looking around at all the parts houses, lowes, home depot, walmart, etc and CANNOT find any 3m 847 anywhere! Who sells this stuff?

 

[kfa4303]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

yeah, that stuff can be a little hard to find. If you're lucky you may be able to get it at a local auto parts store and/or marine supply store. Otherwise, you'll probably have to order it online. It is a little pricey, but you can get on sites like amazon.


http://www.amazon.com/3M-Marine-RUBBER-ADHESIVE-SCOTCH-GRIP/dp/B000LDIAZS

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Thanks man! I was about to begin questioning whether the stuff existed lol! What makes the 847 superior to other adhesive/sealants like the permatex super black or other rtv silicones?

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

My bad, I meant Permatex ultra black. I have tons of this stuff around my house from various projects that I have been on in the past and several that have yet to be opened. If the 847 is the only thing that will work, I will use it, however if I can, I wouldn't mind using some of this ultra black that I have seemed to stockpile.

 

[kbait]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

I used the ultra-black for years w/o issue.. until I bought a parts motor which included a tube of 847. I think that one tube will outlast me!

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Thanks, Hopefully I will be able to get mine back together this weekend after I get the clutch dog and forward gear machined back into specs.

 

[kfa4303]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

I'm not exactly sure what makes is particularly special. I know a local mechanic I go to uses Permatex 1000, black gasket sealant and has never had any issues, and that's in fresh, brackish, and salt water. I believe the 847 can also be used as a sealant on the engine block, whereas Permatex may not. kbait is right though, a little goes along way and one tube will last you for ages.

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Hey guys, a little update on the motor. I have the forward gear and the clutch dog at the machine shop getting the engagement surfaces refaced. The machinist quoted me $50 to reface both of them. If that quote holds, I will be well on my way to having an engine that planes out the Starcraft. I have the 10 hp mounted up right now for the start of the spring fishing season until the 18 is finished. I was able to replace the shift rod and the driveshaft seals fairly easily once I had the right tools. If all goes well I will have the forward gear and clutch dog back next week. I'll keep y'all posted!

 

[kfa4303]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Sweet! I had the clutch dog on my old 10 hp resurfaced and it seemed to work, and $50 is way better than $90+, or so for anew one :/

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Update time again. The machinist was not able to get my gear and dog in this week. Looks like next week will be the deciding week. I noticed something when I was replacing the points and condensers last weekend that I investigated further today. The loose wire fell out of the bottom of the coil exposing the "spike" that leads from the coil to the wire. The interesting thing about this is the copper wire in the core was a nice shade of green and the "spike" from the coil was rusted pretty badly. I am thinking I may have come across the source of a good bit of my idling and power problems. Spring break for us college students is not this coming week but next week and I have a spearfishing trip planned, so I really want this boat running by then. So here goes the battery of questions...

1. Can I replace just one coil or do I need to replace them both?
2. Will this corrosion and rust cause the rough idle and poor power that I have been experiencing?

 

[kfa4303]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Hello again scuba. I believe you only have one coil to replace under the flywheel. However, you should try cleaning the corroded point with some fine grit sand paper first. You should also snip off about 1/2" of the old spark plug wire from the coil end in order to expose some fresh copper. Try hooking them up again and see how she runs. You might get lucky. It won't fix the gear slip issue, but it may smooth out the idle.

 

[AlTn]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

the 2 exterior coils can be replaced as single coils and yes, it could certainly affect idle and power

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Very good. I am going to replace the corroded coil ASAP. I have a couple of other parts to order once my forward gear and clutch dog get out of the shop. I will add a coil pack assembly to the order. This engine has been an excellent learning experience so far. I can see the light at the end of the tunnel and am excited to be just about finished for spring fishing season.

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Also I believe that the new coil will help eliminate the fouling issue that has been plaguing this engine from day 1. I do not know what I will do when I have a engine hanging on the back of the boat that purrs like a cat at idle and screams like a demon at WOT. EXCITEMENT!!

 

[kfa4303]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

I hear you. I almost miss having something to tinker on when the motors running right......almost With new coil(s) and wires you should make a nice hot spark which should reduce the fouling quite a bit. Keep us posted.

 

[scuba_redneck]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Will do! What is the best way to check the spark on a coil and how strong should it be?

 

[kfa4303]

Re: 1973 18 hp Evinrude starts out running great, but slips out of gear

Most folks like to use a gap tester. The spark should be able to jump a 1/4" gap with ease. You can usually get the testers at any autoparts store for under $5, or you can do a search here in the forums for some home made versions. Once each plug consistently produces a plug that jumps the gap, you should be ok. Here's a pic of one style of tester you can get, but there are several others. Of course, you can always ground the plugs on the engine block to see if you get a spark, but it's not very reliable and even if you see a spark, it may not be strong enough, but it works in a pinch, I suppose.