deere8450 hard starting

[boden]

have deere 8450 tractor hard to start just got heads rebuilt pump rebuilt new batteries starter destroke valve and pumping the fuel up does not help have to either like 4 times what am i missing

 

[2cylpartsinfo]

Sounds like a fuel drainback problem or air in the fuel.

Does it exhibit low power once you get it to work? This would indicate ait in the fuel, some sort of problem on the suction side of the injection pump.

 

[Big 86]

Hard to start when hot or cold or both? Does engine turn over good? Does it smoke any when cranking? Using ether to start the engine can lead to engine damage like broken piston rings, which will make the starting issue worse. How did the tractor start prior to rebuilding/replacing all of those parts?

Since the head was rebuilt(I am assuming you mean engine cylinder head) you might check to make sure the valves are properly set.

Rebuilt injection? pump, is the pump timing set correctly? Replace fuel filters? Also you might check the linkage for the orange knob/kill switch to make sure it is moving freely and with correct travel, as the pump must be set correctly for engine to start.

With new batteries and starter, how are the battery cables and connections? Have you checked for voltage loss during cranking?

Just a few thoughts, hope this is helpful.

 

[buickanddeere]

Cranks fast and doesn't fire? Cranks slow and makes smoke ?

 

[Tx Jim]

(quoted from post at 14:05:55 05/09/11) have deere 8450 tractor hard to start just got heads rebuilt pump

Did the valves sink into or protrude from cyl head after rebuild. It's been known to grind rather than replace seats thus lowering compression from valves sinking into head.

Have you checked inj pump timing as it could be off from wear in timing gears?

 

[Bigdaddy4430]

Sounds like a 4430 i once owned traded it off and cured all my troubles.LOL