rkclassic3

It sure sounds like a stuck valve. We used to tap the valves with a rubber mallet to free them, that is also using a penetrating oil for lubrication around the stem area. Spraying your favorite lube around it can't hurt anything. May take some time, but would try that before going into the engine. Rob has the right idea of checking the compression also to tell which one is troublesome.

Keep us posted!

Mike.Rob, And Terry.....Just as you all said ...... i took the both side valve covers off this am, and Number 3 and 4 BOTH INTAKE VALVES were stuch so hard in the block, i had to pound them down, a leather mallet, and another hammer hitting it, then prying upwards and tapping downwards with mallet, and penetrating oil...pb blaster etc...did this to both Intake Valves for 4 steady hours, then i got lucky and Located a Copper Head Gasket......everything is all cleaned up and ready to go back together tomorrow, i learned something, DONT EVER BUY A GAS ENGINE THATS BEEN SETTING OUT IN THE WEATHER UN TARPED OR UNCOVERED, as water definetly went down thru my carburator thru the manifold to the intake valve area, freezing these 2 valves into the head, will keep you all posted as how things go tomorrow.Again i thnak you all for your help and suggestions. putting another 140.00 and my time n labor, hopefully is a good fix, i am worried that number 3 will seize up again, when engines gets good and hot, thats my only worry...o well time will tell...again thanks fellows.

That is a flathead engine i beleive, and to pull the head is pretty simple, sure would tell you a little about the engine condition. Sounds like the bottom end might not be to bad. terry

Hello:

Thank you all for your input, i have 2 intake valves stuck, pulling head today, when i bought this engine it was setting out in the weather un-covered, all except a piece of plywood over engine, im sure rain water got down thru the carb...thanks everyone for your help, will keep you posted.

I drove 485 mile each way to buy this engine, Started it up today, and it is missing so bad, and gasoline shoots up out of the carburator, like it has a valve problem or something, so i am at a stand still now, it has excellent oil pressure 55 to 60 lbs. But a terrible miss in engine, anyone have any suggestions of what i should do next? Any help to this problem would be greatly appreciated. ARE GASKETS AND PARTS HARD TO COME BY FOR THIS PARTICULAR ENGINE? (EN402) Does it sound like i should be looking for another motor? Appreciate any input, to this matter? Was told it was a good motor and only had around 51,000 miles on it.

Does anyone know the part number for a mack EN401 gas engine canister type oil filter?

Does not matter if its OEM or aftermarket. I can"t seem to find a part number.

Closest one i found was at Napa....think the number was 1129 (wix)

OK guys...I just uploaded about 100 photos from our show! Enjoy!

Photo Album

Despite the persistent rain, the event was still a great success! We had over 60 vehicles on display and everyone had a great time! It takes more than a little rain to dampen the spirits of big rig fans!

GREAT PICTURES, THANKS BARRY

BARRY:

I enjoy your news letter, good job posting it, hope to see you all at the open house.

Welcome I am from Northeast Penna. also Lake Ariel,Penna. Joe D.

WELCOME ABOARD ARRON, THATS ONE NICE SUPERLINER YOUR BOSS HAS.

my name aaron, i live up here in Monroeton, PA, i'm 21, i haven't got my cdl yet, but when used to live in NC, i rode around in 1981 Mack Superliner w/ a Challenger 25 Ton Wrecker Body, some of you might know me from hanks truck pictures, largecar mag, & east coast large cars. i am a fan of mack trucks, even though the motors as advertised don't seem to have much power, i know u don't a lot of power from a 400 hp bulldog from what u need from 625 hp kitty cat, & even though my dream truck is a ford ltl9000, i'll take a good ole' bulldog anyday. i hope to learn a lot more about mack trucks here & what makes mack so good.

take care-

aaron

my former bosses '81 superliner: