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Id really like to get a workshop manul and a parts list for this tractor Im rebuilding it .I think its a awesome machine, I was told the headbolts on these tractors where to thin so the gasket would always crack bu my uncles drilled it out and put bigger ones so there was newer any problem with it since.
its a wery powerfull tractor and grate in handling on the fields
The original Zetor 4001 engine this tractor was based on, used M14 head studs. the 5511 had the same bore and stroke, but bigger intake ports and manifold: it came off the factory with M16 head studs. The M16 head studs were also used on the later 6701 engine with 100 instead of 95mm bore. So i doubt that the M14 head bolts were your problem, probably forgot to skim the heads when the gasket was changed. Applying some extra mounting torque also helps, i pulled mine at 160 Nm
C-350, 355 and 360 are much the same I belive, i have partslist and workshopmanuals for 350 and 355, the workshop manual for 350 is not finished in the scan and cleanup yet.