I would definitely put about 4 oz. of Seafoam or Marvel Mystery Oil in the crank case, you might have a lifter stuck on one valves holding it open and as the cam comes up it hits that stuck lifter at the top of it's travel. Seafoam or Marvel Mystery Oil are great for un sticking parts. Before I put my fathers 75 Galaxie I/O boat back in service (after 20 years sitting in his garage), I put about a quart of Marvel in the oil, ran it for 2 hours at low speeds, out on the water and then changed oil, have not had one problem with that motor now over 100 hours later.
Anyway, all I have left to do on it is replace the fender pieces, and maybe I can get on the X. If not tomorrow, definitely Thursday afternoon. 3 weeks to PCB, and the X still needs tires. I got a lot to get done. Anyone wanna come cut my grass??? ANYONE??
Well.......got started on figuring it out, then got sideswiped. Started checking the valves and the intakes were too tight, so I started adjusting them. As I was holding the the front intake adjuster and tightening the jam nut, my 4mm wrench broke off. (Didn't realize I was putting THAT much pressure on it.) I probed all around under the valve cover with a magnet epoxied to a copper wire, but couldn't find the piece of wrench. So.....I proceeded to remove the cover to search more thoroughly for it. Got it off, soaked up all of the oil with a rag, and probed some more. Still haven't found the piece of wrench, but I'm satisfied that it popped off and flew out instead of dropping down into the valve cover. Waiting on new sealing washers to put it all back together.
In the mean time......I've removed the rear tire and sealed the rear spoked rim, and installed Glen's Clutch Pull Relief. I've also ordered new tires, and put in new spark plugs. I decided I'm going to seal the front rim also, and go tubeless up front too. I didn't buy enough sealant to do both at once.
I did drain the oil and there are no metal shavings in it. That lets me know it hasn't spun a bearing causing the knocking noise. I'm leaning more towards something to do with fuel, or the valves being too tight.
A little more time will tell.
Last edited by bulldogparts; 04-16-2017 at 08:14 PM.
Got it out back together, but never found the piece of wrench that popped off. I'm confident it's somewhere safe. Adjusted the valves, emptied ALL of the old gas from the tank while I had it off, put in Seafoam and new gas, changed the oil, coolant, and plugs, and now she's purrin like the LIONESS she is!!!
Just a tiny bit of enrichment to start it cold, use that for about 30 seconds, and then it's purrfect. No knocking yet......I haven't been able to run her down the road and get her hot because I'm putting on new tires, and haven't got them done yet. Saturday will tell the tale. I sure hope all of my optimism pays off. I've spent a good bit of money on everything I've changed out, not to mention my $100/hour labor rate. WOW!!! My wife's gonna owe me BIGTIME!!
Ah, the joys of a job well done!!!!!!
Last edited by bulldogparts; 04-21-2017 at 05:31 PM.
Looks,like I have to go deeper into the engine. The knock is still there. It's pronounced, and it's constant. I've eliminated bad fuel, plugs, and valve lash. My buddy, who graduated MMI a couple years ago, listened and agrees there is something inside making the noise. We looked through different systems in the manual, and he's suggesting a tensioner. We thought it might be timing, so I checked the ICM with the one on his wife's bike, and no change. Guess it's time for some internal engine learning. Wish me luck.
There are currently 1 users browsing this thread. (0 members and 1 guests)