need a glow plug

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db2d
Posts: 2178
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: need a glow plug

Post by db2d » Wed Mar 01, 2017 11:04 pm

The movement is correct. It has to be turned in before attempting to start the engine. It will not work if an attempt has been made to start the engine for approximately thirty seconds, the fuel pressure built up in the pump has to dissipate.

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peislander
Posts: 5
Joined: Thu Jan 21, 2016 7:16 pm
Location: canada

Re: need a glow plug

Post by peislander » Tue Mar 14, 2017 10:12 pm

i recently installed thermostart in my 880. the plug on top of manifold was coarse thread.the thermostart had 7/8 fine thread i retapped it.there was
a spot near intake of manifold that looked like it was cast to be drilled and tapped. but it would require removing fuel lines from pump for installation.
remove manifold for retapping threads so u dont get shavings in engine. How well does the timing retard on injection pump work for cold starting.
the t handle is broken amd siezed on mine. thanks

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db2d
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Location: Monmouthshire

Re: need a glow plug

Post by db2d » Tue Mar 14, 2017 10:34 pm

Thermostarts are readily available with the course thread that will fit into the manifold.

The cold start on the pump works very well.

housebg
Posts: 56
Joined: Sat Feb 18, 2017 10:30 pm
Location: Walker Louisiana

Re: need a glow plug

Post by housebg » Wed Mar 15, 2017 4:28 am

Where can I get a thermal start with coarse thread that will screw into the either plug hole

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ollek
Posts: 3940
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: need a glow plug

Post by ollek » Wed Mar 15, 2017 5:18 am

Ask your local Case IH dealer for a Thermostart that fits David Brown tractors. Look at the following link http://partstore.caseih.com/us/parts-se ... 7ar1261083 The thermostart (not thermal start) has ref number 8 and the text also tells the CAV number.

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testbed
Posts: 29
Joined: Tue Oct 06, 2015 11:44 am
Location: Perthshire

Re: need a glow plug

Post by testbed » Sat Mar 18, 2017 8:47 pm

Yes it only turns about a quarter turn. your exhaust will smoke a bit if it is on when running as the timing is changed by it (advanced) I believe.

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bedwards1966
Posts: 888
Joined: Sun Mar 07, 2010 10:36 pm
Location: North Yorkshire

Re: need a glow plug

Post by bedwards1966 » Sat Mar 18, 2017 10:25 pm

The majority of thermostart units appear to be the same - I have bought them in the past and the same part number fits a multitude of different makes and models. Course threaded if I remember correctly.
The quality of new units isn't always brilliant, they can sometimes fail when they aren't old - some modern parts aren't as good as originals.

The cold start tap on the pump may be a good thing for some and certainly worth a try. However, I have two David brown engines neither of which are happy with the cold start tap but will start fine off the thermostart.

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db2d
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Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: need a glow plug

Post by db2d » Sat Mar 18, 2017 11:06 pm

When operated the cold start on the pump locks the fuel injection in the retarded position 11degrees BTDC .
If an engine is not happy with this there is an issue with the timing.

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bedwards1966
Posts: 888
Joined: Sun Mar 07, 2010 10:36 pm
Location: North Yorkshire

Re: need a glow plug

Post by bedwards1966 » Thu Mar 23, 2017 7:34 pm

db2d wrote:When operated the cold start on the pump locks the fuel injection in the retarded position 11degrees BTDC .
If an engine is not happy with this there is an issue with the timing.
Interesting to hear this. I'm not disputing this as I can only speak from my own limited experience of DB's but both engines I speak of run sweetly enough that I have no cause to doubt that anything is wrong with the timing.
I might try it again on one of them (if it hasn't seized up as I've not touched it for years) but I do recall it didn't like it.
Ah, while writing this I have just remembered that I had the pump rebuilt on one of them 3-4 years ago and have not tried it since - so I think I will give it a go!

housebg
Posts: 56
Joined: Sat Feb 18, 2017 10:30 pm
Location: Walker Louisiana

Re: need a glow plug

Post by housebg » Mon Mar 27, 2017 3:30 pm

Do you need a cut off on the fuel to thermostart or does it have fuel on all the time?

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ollek
Posts: 3940
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: need a glow plug

Post by ollek » Mon Mar 27, 2017 3:43 pm

There is a automatic valve in the Thermostart unit that when open, letting fuel onto a heated spiral resulting in a flame in the intake manifold. This happens only when the spiral in the unit is heated when the Thermostart is used (the ignition key is kept in the pre heat position). The valve closes when the ignition switch is returned to the run position and the spiral cools down.

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