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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

TD5 Glow plug system

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Gwinnibarge

02-05-2004 07:11:07




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I have just started reconditioning a TD5. I started with replacing some glow plugs. The original starting switch that activated the glow plugs is no longer in place. However, there appears to be a buzzer on the far left instrument panel that is in series with the glow plugs (I'm not sure it is a buzzer). Coming off the back of the buzzer is the wire lead that (I think) used to go to the starting switch. Also behind and attached to the buzzer is a coiled heavy guage bare wire (maybe copper). One end of the coil is attached to the wire lead and the other is attached to the other side of the buzzer, which then goes off to the glow plugs. I hot wired from the positive 12V battery terminal to the wire lead. After about 15-30 seconds the coiled wire behind the buzzer was glowing red. The voltage just prior to the first glow plug was about 3 V. The voltage dropped about 1 V after each glow plug. The red hot coil didnt seem right, and the buzzer (if it is one) never sounded. I only kept the system hot wired for about 30-40 seconds. Can someone explain the workings of this thing, in particular the coil and buzzer? Thanks

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RAB

02-07-2004 01:06:09




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 Re: TD5 Glow plug system in reply to Gwinnibarge, 02-05-2004 07:11:07  
You may be able to get a cross reference to a 12 volt glow plug and fit a full set in parallel. Landrovers changed at some point but I can't remember the precise changeover details. Regards, RAB



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jdemaris

02-07-2004 05:20:40




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 Re: Re: TD5 Glow plug system in reply to RAB, 02-07-2004 01:06:09  
Yes, it can be done with a Champion AG44 or equivalent (11 volts, 95 watts). Total current draw for four is around 35 amps, no resistor necessary. Problem is, these plugs burn out after X amount of heat time, often 12-14 seconds. I think, thanks to modern tech., a better system would be to use the new "burnout proof" glowplugs that AC Delco and Beru are making. They are designed for the GM 6.2/6.5s or the International Harvester/Ford 6.9/7.3 diesels. They have built in current limiters, or circuit breakers, to protect themselves. 9 second heat time, 10 amp apiece draw, and 11 volt, parallel operation. You'd have to make adapters though, since they are 3/8" X 24 thread, and the IH 144 engine is tapped for 18 mm. I put them in my AC ED-40 and will do the same for my IH if the originals ever burn out. Right now, though, they work fine although they have a very slow heat cycle - over 30 seconds. I've put these newer glowplugs in my three diesel trucks and haven't had one burn out yet. I often don't use the OEM timer on my trucks, and use my override button instead. You've just got to remember to count off nine seconds when using them.

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ben

02-05-2004 18:29:17




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 Re: TD5 Glow plug system in reply to Gwinnibarge, 02-05-2004 07:11:07  
the indicator is a resistor if you bypass it, you will burn up your glow plugs



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jdemaris

02-05-2004 18:05:48




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 Re: TD5 Glow plug system in reply to Gwinnibarge, 02-05-2004 07:11:07  
I think the T-5 has the same British/Indian engine that my B-275 wheel tractor has. 144 cubic inche engine that takes Champion #155 glowplugs. The thing on the left side of the dash is just a glowplug indicator. It gets wired in series with all the glowplugs, and lets you know when they are hot enough for the engine to be started. The indicator is a coil of wire with the same resistance as a glowplug, and usually has a piece of fireproof glass or mica over it. It will heat up gradually, and when it's finally bright red, then you can assume the glowplugs are also. Early engines use a CAV inline injection pump with a air-governor, and later models have a CAV rotary pump with centrifugal governor. T-5 and the B-275 were sold around 1960. As far as wiring goes, my original switch was bad or missing; I don't remember. You want full battery current to run through the inicator and then through the glowplugs. I used a push-button switch hooked up to a relay, and let the relay carry the current fot the glowplugs. That's a better hookup then letting a switch carry the current unless you've got a real heavyduty switch.

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gwinnibarge

02-06-2004 07:07:45




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 Re: Re: TD5 Glow plug system in reply to jdemaris, 02-05-2004 18:05:48  
The folks I spoke to at Hazzetons in Cumberland maine, said the glow plugs for the TD5 cross reference to the Champion CH28 plugs plugs. There's about $14 at NAPA auto parts. FYI.



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jdemaris

02-06-2004 19:18:32




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 Re: Re: Re: TD5 Glow plug system in reply to gwinnibarge, 02-06-2004 07:07:45  
I just doublechecked. The original glowplug was an AG28, then Champion changed the number to CH28,and now the same plug is sold under the part # 255. Still the same plug. 18 mm, .9 volts, 40 amps, 13/16" hex, and #10-32 threaded connector. The plugs are wired in series (not parallel) with the resistor/indicator. If any one of them burns out, the circuit is broken and they all stop working.



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jdemaris

02-06-2004 18:52:06




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 Re: Re: Re: TD5 Glow plug system in reply to gwinnibarge, 02-06-2004 07:07:45  
Yeah, mine were CH28 also. But the new Champion numbering system and box uses the number 255 now. I paid $12 apiece.



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