440 gremlins

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stevocom
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Posts: 46
Joined: Mon Jul 12, 2010 3:50 pm
Location: Mentor Oh

440 gremlins

Post by stevocom »

Help!!!! My girl is sick, 1978 F36, 440 issues. So I’ve been chasing varnish issues due to ethanol since I bought my boat 12 years ago. Basic simple solution, swap the filters, blow out a few specific fittings, fuel lines etc. and I’m back in business. Not this time! This ones stumped me. Can’t seem to get my port running right. Maybe time for a basic tune up. New plugs, wires, cap, rotor, coil, ballast resistor, even did a new ignition module, inspected the weights, and springs in the distributor, brand new magnetic pickup, oil change etc. and things got worse. Way worse! Now the damn thing doesn’t even wanna start. And yes I checked the firing order, 5 times! I had even swallowed my pride, and hired a mechanic, he couldn’t figure it out either. We even swapped distributors along with a couple other key parts wit the starboard, and same issue. It does 100% sound like a timing issue. Yet the timing is spot on! This is a standard rotation engine. I can get it started, once started it will barely run, and only run at 1400 rpm or greater, popping, shaking, stalling etc. Keep in mind this engine ran great, and never missed a beat, til I decided to do a basic tuneup, no internal damage, no internal engine noise, cam sounded great, can’t imagine it was damaged. Getting fuel, that is not the problem!
The only thing I can think of is cam to crank timing. I’m not 100% positive what could of gone bad, or wrong within the timing chain. I don’t hit a log right before this engine started acting up, didn’t really think this could related to my problem, just ironic, but who knows, because I don’t! Please help.

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WayWeGo
2021 Gold Support
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Posts: 772
Joined: Fri Feb 13, 2015 11:13 am
Location: Oakton, VA / Rhode River - Chesapeake Bay

Re: 440 gremlins

Post by WayWeGo »

Your port engine is reverse rotation on a F-36 Convertible. Is there any chance something you did on the tune-up should be changed because you were thinking standard rotation?

All that popping sounds like spark plug wires in the wrong place. Reverse rotation engine firing order is 12756348. Cylinder number 1 is the front left and both standard and reverse rotation engine distributors rotate counterclockwise.

Hope this helps...
1975 F-36 Convertible
Twin Chrysler 440's

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