7710 hard to start!

Jo-ker

Member
Picked up a 7710 4wd with 3300hrs last
April.She is a brute and seems to have all
kinds of power.Having said that, it doesnt
start up easy on cool mrngs(45f);we end up
pushing in the excess fuel button to get it
going.Also has problems starting when its
really cold, and has been plugged in for 5-6
hrs!Battery and starter are in good shape.It
doesnt use oil so i think the rings are in good
shape. Kinda bugs me cause my 3600 diesel
starts like a gas engine in the cold! Wonder if
its time to adjust valve clearances etc?
Anybody else have this experience with their
7710?
 
If it's starting hard after being plugged in, me thinks you have a fuel bleed-back issue. Does it make a difference whether or not there's fuel in the top tank?

If it starts easier with fuel in the top tank, look carefully at all of your fuel lines going down to the bottom tank. Look for steel lines with holes rubbed in them, or loose fittings.

Having said that, most of those engines need to have the excess fuel button pushed in when it gets much below freezing.
 
My 6610 will not hit a lick if I do not use cold start button when under 50 outside, and will not start if under 30 without being plugged in. It is low hours and runs good.

I would verify that the heater is working. I would also change oil in the injector pump if it is an inline version. I change the oil in my pump every service. You should look for Diesel around the lines and pump to determine a leak.
 
When were the injectors serviced Ford calls for every 600 hrs. I usally find at least one injector out of tolerance. This will increase cylinder wall life a bunch. Poor cold starts and smoke are good signs that there is a problem.
 
I would suspect Bern is steering you in the right direction with a fuel bleed back issue. On mine I have a leak on the seals on the supply line from the filter head to the injection pump manifold. It does exactly as Bern described... starts fine with a full top tank... and needs to be cranked and cranked if the top tank isn't full. these things are funny in that they will bleed back but never really show a visible fuel leak. Next time you go to start it... pump the fuel lift pump manually for 30 sec to a minute and see if that makes a difference. Other things to observe... if it's bleeding fuel back it will not smoke while you crank. If it's smoking it's getting fuel.
Beyond that... I've always found that mine is a dog to start in cold weather. I keep dual 600w block heater elements in it and it starts well with them... but otherwise it's excess fuel button in and thermostart for 1-2 min sometimes or just straight to the heroin..

Rod
 
"these things are funny in that they will bleed back but never really show a visible fuel leak."

Fuel is far more viscous than air, meaning air will leak into a hole that fuel might not leak out of.
 

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