beatngu Posted May 13, 2018 Share Posted May 13, 2018 So I have the 401 running but has a hard knock from the front of the block. I noticed yesterday excessive smoke from the crank vent tube which makes me believe there may be a stuck valve. Is there a backwoods remedy for this such as diesel down the plug hole? I would just start tearing it apart but I have already seen that gaskets may be a hard buy. Quote Link to comment https://www.bigmacktrucks.com/topic/53346-sick-flathead/ Share on other sites More sharing options...
Rob Posted May 13, 2018 Share Posted May 13, 2018 Stuck valves do not knock but they will disallow the cylinder to fire. You can check this by removing the side cover on the engine and visually look to see if a valve is "hung" open by looking at the clearance between the valve stem, and tappet, (lifter). If one is found hanging open, use a long screwdriver and hammer and gently persuade it back down. If you have a knock there is something loose internal to the engine. Could be a rod bearing gone bad. 1 Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/53346-sick-flathead/#findComment-398764 Share on other sites More sharing options...
beatngu Posted May 15, 2018 Author Share Posted May 15, 2018 Bugger, might as well save some headache and yank everything out then. I figure the only way to do it is pull the cab off and drop the 673 in with the 20 speed. Then have my buddy sandblast everything while it is in pieces. Quote Link to comment https://www.bigmacktrucks.com/topic/53346-sick-flathead/#findComment-398858 Share on other sites More sharing options...
Maddog13407 Posted May 15, 2018 Share Posted May 15, 2018 good luck with that 673 ''drop in place'' idea. you better have a B61 parts truck handy. Quote Link to comment https://www.bigmacktrucks.com/topic/53346-sick-flathead/#findComment-398859 Share on other sites More sharing options...
beatngu Posted May 15, 2018 Author Share Posted May 15, 2018 Indeed I do, taking the cab off is the only way I can do it as I only have a small new holland at my disposal to do this task. I can't justify cribbing and bottle jacks for this task lol. My b61 was a wash so it became the donor. It all pans out in my head but certainly there will be at least one major issue Quote Link to comment https://www.bigmacktrucks.com/topic/53346-sick-flathead/#findComment-398861 Share on other sites More sharing options...
beatngu Posted May 18, 2018 Author Share Posted May 18, 2018 So I have a friend to help me with his knuckle boom truck, I want to believe we can find a way to do it without pulling the cab now. The only thing I am worried about is the clutch linkage, does the spring shakle have to be pulled or does the shaft pull out from the transmission? Quote Link to comment https://www.bigmacktrucks.com/topic/53346-sick-flathead/#findComment-399028 Share on other sites More sharing options...
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