John deere 3520 very hard to start but when it does eventually runs normal

[joey14036]

Run them for 5-10 seconds and see if it helps, maybe even 10-20.

OK. I will give that a shot this weekend when im going through the tractor. thanks for the advice!

 

[John_Mc]

Diesel engines are very sensitive to starters which are operating too slowly. I just ran into this on my 20 year old NY TC33D. I was having hard starting issues - had to crank for an extended period, sometimes had to cycle the glow plugs multiple times. It acted exactly like tyring to start on a tough winter day. When it did start, I'd get some blue smoke for a few seconds, then it would run as well as it ever did. Air filters were fine. Glow plugs operated normally. I feared valve or compression problems.

Turns out, the starter was worn and dragging resulting in slower cranking. It came on so slowly that I did not really notice it. Once the dealer replaced the starter, it started like new. The service tech explained that when starting a diesel engine, cranking speed makes a huge difference. Since here is no spark plug to ignite the fuel/air mixture, it relies on the heat of compression to ignite the mixture. Slower cranking = less heat generated. Less heat = difficult or no start. The puff of blue smoke is from all of the unignited fuel that remained in the cylinders from the extended cranking.

 

[carlens.la]

Do they activate automatically or must you engage them manually?

Jd 3520 bought at auction. hydro diesel. turns over and eventually starts little blue smoke and when it fires it seems to idle fine. it just takes a minute or more of turning over and eventually starts. acting like its extremely cold out but its summer time so i know thats no the issue.

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[Deere Dude]

The key must be ON, then depress the key inward for 10-20 seconds, then turn key immediately to start. That should run the intake heater.

 

[Williy]

My cousin had a 55 ford and his starter went
south. Took it to a garage and the mech turned
down the windings on the starter said it will crank
the engine faster. It really spun the engine

willy