436 engine noise

Had to take my 1586 into dealer for some work - they told me I needed an OH cause I had a scored piston. Engine will start and has a rythmic tick to it and a fair amount of blowby - after warmup the tick goes away -- they claimed a scored piston or wrist pin bushing. Well brought it home - told them I"d do the OH -- Its been like this for a year (since I got it- come to think of it when I got it from original owner no noise until few days after unloading when it was cold out then I noticed it) - started it other day - was hot out (mid 90"s cbut cold engine) and no noise and virtually no blowby. Any ideas? Makes me think I dont need to OH it - done it last 2 times I started it - ran like new 436 in it. Dont really want to spend $1500 if I dont have to - It"ll run the chisel this fall but I have backup -- If it goes down during planting it takes a 1/2 day to switch monitor and starter fertilizer controler over. Wondering if valve noise could be the cause like a valve out of adjustment and tapping - Just thought of this --did an OH on a 706 gasser once and made same type of noise - we had droped pushrod and missed the lifter and it was hitting directly on the cam but would still run great - obviously found and fixed that ASAP.

Do you hear that "thumping" noise at the air intake?

Mine was ticking back about the #5 cylinder and had that thump sound up front.

Had the local Red Shop adjust the valves and it totally made a different tractor out of 'er.

Hope yours is simple too,

Allan

When we broke the crank on the 1466 it didn't knock very loud but had a noticeable miss. Listen around the engine with a broom handle see if you can determine source of knock.

Not sure which series engine you have, but early ones would flat camshafts occasionally. By the time you fix that, you may as well overhaul the entire engine. Might be worth a quick look, before going any deeper.