The Stovebolt Site Forums The Shop Area Engine Shop Now what did i do?

My '59 3600 Apache w/ a 261 6 was pulled and sealed this summer(by me)on the first test drive it runs great until i get to highway speed(about a mile out of town) then something is "pulling" the engine down to the point i have to stop and cool it down. I disconnected the trans brake but no improvement. It can sit in drive and idle w/ no prob, just when you get it on road,then the problem. When this happens and i push in the clutch in makes a "whinning" noise....? could it be the throw-out bearing or something i didnt put back in properly?

Can you tell if it is the engine lugging down or the truck its self. Sounds like the brakes are dragging. The master cyl push rod may need adjusting. If the clutch makes a noise when you push it in it is likely the TO brg. but this wouldn't cause it to bog down.

it feels like the engine bogging down. i had tranny out and wonder about the TO bearing placement. does the oblong spot go in the fork? It just seems like when something heats up it pulls the truck down to the point where it could stop it.....i know this sounds strange but i've never had anything like this happen before.

Tobin,It would help if we knew what you did when the engine was "pulled and sealed".What parts were changed?
Could there be a exhaust restriction when it has this power loss?Is there any change in the exhaust sound?Loose things in the muffler can cause intermittant blockage but usually require a shutdown to return to normal.
Does the temp guage work and does it indicate normal temp at this time?
It sounds like you could be experiencing piston seizure maybe from overheating.
Will it idle when it has this power loss?or do you have to keep the throttle open to keep it running.
If the brakes were dragging it would be detectable by the brake(s) heating up and when you release the clutch while on the road the engine would run normally but the vehicle would drag quickly to a stop.
Time for a war story;
In the late 60's with the natl guard in convoy to Ft Stewart Ga with the usual equipment of the day which was left over from the Korean war days.We had several GMC deuce and a halfs and they were sure tough old trucks with their 302 hooked to a hydra-matic box.Loaded and hooked to a loaded trailer they would put the speedo hand 2 spaces past the last numbered space which was 60 if you were on a good downhill run--and they managed to use less fuel and keep up better with traffic than the Dodge power wagon type 3/4 ton truck or ambulance.Had one throw a fit where it would start losing power and get down to a crawl forcing the driver to stop-he would shutdown and check his engine and when restarted it was back to normal for a while when it would do the same trick.My truck was behind him so we pulled off too and after the second time I got in to drive it looking for a repeat performance and I didn't have long to wait.When i pulled off the road I kept it running but not easily and it was leaking exhaust from several joints between muffler and engine with a loud hissing sound.Well the problem was obviously a plugged muffler so we dropped a section of pipe loose and they sure were obvious for the rest of the trip but I think they changed driver and assistant a few times to get a rest from the noise.A muffler replacement cured it.We loved to go through Atlanta in convoy as fast as we could run and cut the switch off-turning it back on at a appropriate seeming time and watch the expressions on people's faces in nearby cars.Some of these things would make a hellacious bang and occasionally the muffler would split at the seams or be swollen totally round instead of oval..The M151 jeeps were great at this trick