63 cd-21a stops abruptly at high rpm

[indystevie]

1963 5.5 seahorse. complete gasket set, plugs, wires, points, condensers, carb kit, float, impeller, thermostat... I didnt replace coils. Can I ohm them to see if ok? engine started fine but abruptly stopping at high rpm if sustained more than 1 or 2 min. Stops very quickly. good fuel, vented tank... When it dies, I can start it up immediatly. when grounding ignition at high rpm, it quickly slows down and stops. When disconnecting fuel at high rpm, it quickly slows down and stops. Did this to determine fuel or ignition symptom. It just stops so fast it seems like it is trying to lock up. If I throttle it down the exact second it is ready to stall, it will recover. Any ideas???

 

[cougar1985]

Re: 63 cd-21a stops abruptly at high rpm

what color were the coils?are they a chalky white or a yellowish color? their no good.any cracks ,no good.if they are original, they are most likely on their way out.

 

[indystevie]

Re: 63 cd-21a stops abruptly at high rpm

The coils are green, however they physically look good. I wanted to find out if I could test them somehow. BTW, NONE of the stalling issues happened until I changed over the ignition. I thought that since it was able to reach max rpm now, something else may be the prob... I should know better... It also is a little bit harder to start now than before the rebuild...

 

[indystevie]

Re: 63 cd-21a stops abruptly at high rpm

A mechanic was telling me it was due to heat. I dont agree. The motor circulates great, water temp outlet never exceeds 110f at higher rpm, and 90f at idle. I'ts just binding up instantly at high rpm.

 

[F_R]

Re: 63 cd-21a stops abruptly at high rpm

Binding up?? Aha! Is it also stiff with the plugs out and turning it by hand? Remove the water pump and the bearing plate beneath the pump. Look at the end of the bearing for heat damage. That would be a broken shock absorber in the lower unit.
http://i155.photobucket.com/albums/s311/frankr_photos/Shockabsorberoperation.jpg?t=1188753646

 

[indystevie]

Re: 63 cd-21a stops abruptly at high rpm

Shock absorber? Is that going to be like a shock buffer? A rubber snubber of some sort. I thought that the shaft from the powerhead connected directly through the pump housing, impeller and then into the lower unit directly splined to the gear. after it stops, I can instantly restart it with no apparent friction. Plugs in, plugs out, it turns over the same.

 

[indystevie]

Re: 63 cd-21a stops abruptly at high rpm

Hey, I just viewed the link you sent with your reply. I understand now. I will check that out. thank you
get back with you soon

 

[samo_ott]

Re: 63 cd-21a stops abruptly at high rpm

FR, did they have the shocks in '63? I thought they stopped em in the 50's? I'm pretty sure my '61 doesn't have one...

 

[F_R]

Re: 63 cd-21a stops abruptly at high rpm

I have the '63 parts book here in front of me. It has the shock absorber.

I think all the 5.5s had them. They did away with it on the later 6hp models, using a rubber hub propeller instead.

 

[OptsyEagle]

Re: 63 cd-21a stops abruptly at high rpm

I have a 1961 5.5Hp and it definitely has a shock absorber.

 

[samo_ott]

Re: 63 cd-21a stops abruptly at high rpm

Dang, then I missed it down there! Guess it works well on mine then!