Diesel glow plug light.

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Diesel glow plug light.

Post by rgreenall on Mon May 27, 2013 12:41 pm

I have a Lombardini diesel engine in my Hijet. It won't start and the glow plug light stays on. Any ideas.

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Re: Diesel glow plug light.

Post by HighlyJetted on Mon May 27, 2013 1:53 pm

On those, not that I have ever touched on, doesn't the glow plug light also double as an engine warning light?!

When you say it won't start, does the engine turn over when you turn the key?
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Re: Diesel glow plug light.

Post by rgreenall on Mon May 27, 2013 8:34 pm

Yes it turns on the key. took plugs out and fuel vapour shooting from all ports. put plugs back in, turn ignition on and wait but the glow plug heater light stays on and it doesn't sound like it's trying to fire. All fuses look okay to.

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Re: Diesel glow plug light.

Post by rich the mechanic on Mon May 27, 2013 9:21 pm

It sounds like the glow plugs arn't heating the chambers enough to give the diesel the heat needed to ignite. Don't know how much they cost but they do burn out eventually.
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Re: Diesel glow plug light.

Post by HighlyJetted on Mon May 27, 2013 9:58 pm

If that is the case with failed glow plugs, then a blow torch shoved in the air intake would have it started.

Also when was the last time it ran? How well did it run? Any more information?
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Re: Diesel glow plug light.

Post by rgreenall on Tue May 28, 2013 8:04 pm

I bought it off E Bay with a knackered head gasket, yes that old one. Fitted brand new glow plugs. Can I test the first wire to the glow plug link of wires ? I've never worked on a diesel before only petrol, testing them is easy. Crying or Very sad

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Re: Diesel glow plug light.

Post by Guest on Tue May 28, 2013 9:08 pm

Not familiar with the Jet Diesel system but as far as all diesels I have worked on they all have a relay and with fitting new glow plugs you know they are ok so check out the relay because 4 glow plugs take quite an amperage and the contacts in the relay burn out .
Dead easy to check out --- use a volt meter on the connector on top of the plug to see if there is power or a 12v light bulb and holder to see if the there is power there WITH THE IGNITION TURNED ON.
Ignore any yellow glow plug light as they are externally temperature controlled --- the colder the temperatature the longer the light is on for.

The relay regardless of temperature or the yellow light stays on for 20 to 30 seconds. Listen out for the relay clicking off and if you have a cold tired engine I always turn the ignition off and straight back on again and wait again to hear the relay click off then start the engine.

Once you have checked that you have power ( and assuming you do have ) try the starting method I have suggested.

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Re: Diesel glow plug light.

Post by HighlyJetted on Wed May 29, 2013 12:07 am

As I mentioned before,

If you think it may be a heater plug issue, by shoving a heat gun or a blow torch into the air intake it will start. That way you know its just a heater plug issue.

If it won't start with an external heat source then its something more sinister.

I use this technique on mini diggers, tractors and vans.

If heat doesn't make it run, next to inspect is:-

Test to see if you get any derv to the injectors by cracking a feed union loose
fuel cutoff solenoid on the pump is a common play stopper
pump timing slipping - but you need special equipment to set it properly on every thing i've had in bits.

I'm no expert derv mechanics, but just to give you some ideas what I do, then if that fails I refer them to a derv specialist as I'm out of my depth.

Give me a petrol!
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Re: Diesel glow plug light.

Post by Guest on Wed May 29, 2013 12:11 am

Just had another thought about your glow-plug problem. If as I can only imagine it must have -- a relay for the glow-plugs-- then check out the continuity of the feed lead from the battery +terminal. The feed for the relay will come either directly off the positive terminal of the battery OR from the positive feed lead from the battery to the starter motor solenoid connection and then a lead from the solenoid to the glow plug relay connection.

The stud and nut can get very hot both on the starter or the solenoid and the lead terminal burn out around the thread of the stud and short ( or make a poor connection ) .Check and see that the nuts are nice & tight.


Once again if you have a volt meter you can check the voltage out and see what readings you are getting.

Happy hunting. Should keep you out of mischief for a little while, WOODY.

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Re: Diesel glow plug light.

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