1972 18 HP Fastwin problem, maybe electrical

[Kark]

Greetings everyone. I recently purchased a 1972 18HP Fastwin Model# 18202R. It starts right up pumps water ok but after 10 minutes of running time or there abouts it dies and will not start. After a cool down time of 30 minutes or so it is happy to run again for 10 minutes. I am thinkin of something electrical getting hot and failing. Has anyone else had this issue or heard of it? Thanks

 

[ultra353]

Re: 1972 18 HP Fastwin problem, maybe electrical

Even though its pumping water it still could be overheating. It could have a stuck thermostat. How hot is the head when its been running, you should be able to put you finger on it for 3-4 seconds before it burns.

 

[nwcove]

Re: 1972 18 HP Fastwin problem, maybe electrical

check for spark after it dies.

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

I have not had it die on me yet, this is what the person I purchased it from told me, 10 minutes then dead for 30. I threw it in a tank at home fired it up. Water comes out but not what I think it should be and if I get near the head I will get burned. A drop of water on the heads boils to steam instantly. After a little more watching it seems the impeller only works a short time. I shut the engine down to prevent damage when I noticed only exhaust coming out.

So it waters well when started then quits. Does this model have an over-heat safty feature that shuts it down, never heard of one but it would be kewl to have. I think I see a new impeller in my future and maybe a thermostat. Thoughts?

 

[nwcove]

Re: 1972 18 HP Fastwin problem, maybe electrical

water pump and thermostat are a given for basic maintenance. dont think theres any safety for hot shut off, it probably is just getting too hot and seizing up. a head gasket is also cheap and probably gunna be needed, and you may want to make sure the head isnt warped (easy dyi fix if it is a bit twisted)

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

That sounds terrible. I know it is over heating so off to get and impeller and thermostat. I hope the siezing then cooling, starting and then seizing again over and over is not the case, what punishment. Anyway will change out those parts and get her going again, as long as she is watering well I will just let her run and see if she shuts down. Thanks

 

[kfa4303]

Re: 1972 18 HP Fastwin problem, maybe electrical

H Kark. You may as well pull the flywheel can check out the ignition. The symptoms you describe can also be attributed to a bad coil(s). A new set of points and condensers is probably good idea any way. You can get all the parts you need right here at iboats. Just click on the MARINE STORE tab in the top left corner of the page. A water pump, tune up kit (points and condensers), carb kit and head gasket shouldn't cost more than $70, and you can do all of the work your self. Check out these links. They'll help you get her running in no time.



http://forums.iboats.com/showthread.php?t=158086
http://www.duckworksmagazine.com/07/columns/max/index1.htm
http://forums.iboats.com/showthread.php?t=167352

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

Thanks, for the info. My guess is that the engine is heating up way to hot and inturn that is effecting the coils and electrical system and causing it to fail and the engine dies. I will get the impeller changed out today and fire her up. It starts on a pull or two on the rope currently so that is good news. I also found that the little do-hicky piece of metal that connects the slow speed jet to the adjustment knob under the cowling is missing have to find or fab one.

UPDATE: Got a reply back from the PO, he tells me the motor just quits after 10 minutes but still pulls freely so it does not has not seize, thats a good thing. Might be on the right track with repair to the cooling system to fix the issue.

 

[kfa4303]

Re: 1972 18 HP Fastwin problem, maybe electrical

yeah sounds electrical. no worries. you can literally replace the entire electrical system (coils, points, condensers, s'plugs and s'plug wires) on one of these old gems for under $70, if need be, and it only takes a couple hours. If the coils look good, they usually are. There's a vid on youtube that tells you how to test them. If they are ok, then it should only cost $40 max. I'll see if I can find it and post it.

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

Took the lower end off and checked the impeller. It is brand new, looks like someone went through it not long ago. An interesting thing is that there are no gasgets or sealant used anywhere on it, the thing is just metal bolted to metal and thats it. think I will look for an impeller kit. I have to beleive there should be a gasget between the top and lower halves of the impeller housing.

Also: checked the thermostat. There wasn't one, just an empty chamber where one should be.

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

Looking here on I boats I can not find a water pump rebuild kit for this exact year and model. I did find http://www.iboats.com/mall/partfind...gd_poid=110866&gd_row=10&**********=810434893.
which probabbly covers it as it has those years 49 - 78, HP10 - 25 and is the correct bolt pattern but I do not see any gaskets. Am I wrong about it needing one (just use a sealent maybe)? Is there another seal and I am just not seeing it? This is my first time working on the cooling system so please bear with me. Thanks

Also: At slow idle it does not pump water at high speed it pumps water good. Just seems like sucking water through a straw with a hole in it not so good until the RPM's pick up and compinsates for the air leakage. Just a guess ay other ideas are very welcome. Thanks

 

[kfa4303]

Re: 1972 18 HP Fastwin problem, maybe electrical

Hello again Kark. No gasket between the waterpump housing and the stainless steel impeller plate. They really do just mate together surface to surface. My '61 10 hp had a gasket underneath the SS plate, but many newer models don't even have that. There is an oil seal that the drive shaft passes through, which is under the SS plate, but that's about it. This link will show you an exploded diagram of how it all goes together.


http://www.marineengine.com/parts/j...18202R&manufacturer=Evinrude&section=Gearcase

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

Not sure then, I can only assume that there is blockage somewhere in the water jacket. At low speed it does not push water at high speed it does. Will have to figure out how to clean the passages of any blockage after I figure out where the blockage is. UGH!

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

I removed the lower end and hooked the water tube to the hose and get plenty of wate so no blockage, however I found several water leaks in the head gasket. I will replace the head gasket and see if this resolves my heating issue

 

[Daviet]

Re: 1972 18 HP Fastwin problem, maybe electrical

It is possiable for a defective head gasket to pressurize the cooling system and overheat the engine.

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

Thats what I am hopeing/thinking. Turning the water to steam since it is not under pressure and stopping the cooling and if the steam pressurizes the engine it may prevent water from the pump entering the engine. Can the motor be ran at low rpms without the lower end attached? I have a hose clamped to the water tube now under city pressure. The water runs freely but squirts out these holes in the gasget on the head and exhaust manifold. Once back togeather with new gaskets can I run it this way without attaching the lower end just to test if not reved up to high? Thoughts?

 

[Daviet]

Re: 1972 18 HP Fastwin problem, maybe electrical

As long as you have a hose attached to the water tube it will be OK to run it with the lower unit not attached, don't run above a high idle.

 

[Kark]

Re: 1972 18 HP Fastwin problem, maybe electrical

Heating issue resolved, changed the head gasket and hooked her up to city water, no leaks. Reinstalled lower unit dumped her in a barell and the water is flowing out of her great. I can now touch the head and not be instantly burned after she has been running for 5 minutes and the water is a nice luke warm coming out. Thanks everyone, now on to the next one.

 

[milliesdad]

Re: 1972 18 HP Fastwin problem, maybe electrical

Do water pump kit, not just impeller,and thermostat. Should cure your problem, then pull flywheel and inspect. change out points and condensors, replace any coils that look bad. If you have to ask, it' bad.
Torque flywheel nut to 40 ft/lb.

Your motor acts exactly how mine acted when the water pump went bad, I tried just impeller, but get the kit with the wear plate. replace the grommet in the pump housing, and be extra careful to get water tube in correctly.