Sparks

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Patrick98
Posts: 49
Joined: Thu Aug 02, 2018 7:44 pm
Location: Bt344st

Sparks

Post by Patrick98 » Sat Apr 13, 2019 7:33 pm

Hello people.. tell me if I'm an nuisance.. I have my coolant system sorted and when waiting on my radiator to be referbed I took the injectors out and noticed a lot of suit build up as well as oil on the injector hole walls.. once testing the coolant system I had the tractor running and it was hard to start and alot of white smoke with spits alot of fuel pass the injectors (the tractor is hard to start if you didnt read my other topics).. ino she needs new washers to seal and Im waiting on new washers.. once the tractor was going I noticed a few sparks coming out of the exhaust with high throttle.. I still need to compression test her.. the question I have is why is there sparks?? I haven't noticed this before.. thanks..

User avatar
rid54
Posts: 171
Joined: Mon Oct 13, 2014 8:20 am
Location: Vallentuna, Sweden

Re: Sparks

Post by rid54 » Sat Apr 13, 2019 8:40 pm

Very generally speaking here, no specific knowledge of your specific tractor...

Diesel engines need good compression to create the heat needed to ignite the fuel, when starting them from cold. They also need proper fuel delivery. Bad starters need compression check and fuel delivery check. The latter includes going over all controls and linkages to the injection pump as well as ascertaining that the lift pump delivers properly during cranking (clean filters, lift pump working OK etc.). Starting from cold requires that max fuel delivery really is max. And cranking speed needs to be up to par = good battery and cables etc.

Soot deposits may stem from bad combustion (bad compression), bad oil control, or very short run times of the engine between cold starts.

Sparks from the exhaust may indicate soot/debris acculmulating in the exhaust outlet and igniting from hot gasses as the engine runs. It may also be particulate matter that has entered the cylinders and is blown out with the exhaust. If the tractor hasn't been used properly for a while, focus on the basics to begin with (starting, compression...) and ascertain that there is no compression leak into the cooling system (head gasket bad).

Patrick98
Posts: 49
Joined: Thu Aug 02, 2018 7:44 pm
Location: Bt344st

Re: Sparks

Post by Patrick98 » Sat Apr 13, 2019 10:01 pm

rid54 wrote:
Sat Apr 13, 2019 8:40 pm
Very generally speaking here, no specific knowledge of your specific tractor...

Diesel engines need good compression to create the heat needed to ignite the fuel, when starting them from cold. They also need proper fuel delivery. Bad starters need compression check and fuel delivery check. The latter includes going over all controls and linkages to the injection pump as well as ascertaining that the lift pump delivers properly during cranking (clean filters, lift pump working OK etc.). Starting from cold requires that max fuel delivery really is max. And cranking speed needs to be up to par = good battery and cables etc.

Soot deposits may stem from bad combustion (bad compression), bad oil control, or very short run times of the engine between cold starts.

Sparks from the exhaust may indicate soot/debris acculmulating in the exhaust outlet and igniting from hot gasses as the engine runs. It may also be particulate matter that has entered the cylinders and is blown out with the exhaust. If the tractor hasn't been used properly for a while, focus on the basics to begin with (starting, compression...) and ascertain that there is no compression leak into the cooling system (head gasket bad).
Head gasket is 100% as I said I still need to compression test so this will give me a good indication of the engine health.. when I took the injectors out there was some sort debris that fell into the cylinder but didn't pay any attention to it

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cobbadog
Posts: 549
Joined: Tue Oct 11, 2011 6:18 am
Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: Sparks

Post by cobbadog » Sun Apr 14, 2019 5:47 am

Your embers comming out from the exhaust may also be from loose carbon from when you pulled the injectors out. While waiting for the new washers, go through the rest of the items listed above and also put your battery on charge so that it is up to spec when it is time to fire up.
Once you are sure about your compression test and it passes then do a start up and see how it goes from there.

SteveCollett
Posts: 562
Joined: Wed Sep 24, 2008 8:17 am
Location: Suffolk

Re: Sparks

Post by SteveCollett » Sun Apr 14, 2019 9:38 am

sparks coming from exhausts is not at all uncommon, and many times have set a following load of straw on fire in very dry times

User avatar
ollek
Posts: 3741
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: Sparks

Post by ollek » Sun Apr 14, 2019 10:08 am

As said, sparks from the exhaust is normal. This is why machines working in dangerous conditions have to have spark arrestors fitted.

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