Glow plug timer relay - 300tdi

Anybody know what voltage the glow plug timer relay puts out. I'm talking about PRC6913 on a '96 300tdi,

Although the input is 12v the relay output starts at 9.5 and climbs to

10.5 (measured at the relays spade) before the timer cuts out about 8 seconds later. This heats the plugs but not enough to glow which only seems to happen if I strap the plugs directly acoss the battery.

I've tried a new relay and get the same result...and also tried earthing the relay straight to the battery - I assume the temperature sensor is within the relay body itself. Perhaps the warning light or timer mechanism is 'stealing' the extra voltage ?

I'm looking for the cause of the big blue cloud that follows me around for the first 5 minutes on colder mornings

ChrisG '96 Defender - corrosion, squeaks and leaks '53 Series One - Dust, bodges and leaks

Reply to
ChrisG
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In message , ChrisG writes

If the cloud really lasts for five mins then it will be nothing to do with the heater plugs!

I would be looking at valve stem oil seals or turbo.

Reply to
Marc Draper

Is that 10.5 open circuit or with the plugs in line? With plugs in I'd expect a voltage drop which may account for that but otherwise 10.5 seems low. I could on;y suspect a connection problem in the latter case, maybe engine to earth strap?

TonyB

Reply to
TonyB

.......And if it's just on start up only it's normal!! TonyB

Reply to
TonyB

In general terms (no 300tdi experience) it sounds fine - there's plenty of engines out there using glow plugs rated as low as 9 volts. If nobody else come sup with an actual voltage take a glow plug out and read what voltage is marked on it.

Reply to
EMB

Have you measured the relay input voltage when the glow plugs are on? It may be showing 12V with the plugs off, but it will probably drop when the plugs are energised, due to voltage loss in the cables. If you realy are loosing 2 volts or so across the relay contacts then the relay is duff.

Nothing to do with glow plugs that mate! If it only does it for 5 minutes, and does not smoke the rest of the time, then you have no problem, pretty normal for a diesel engine.

Reply to
SimonJ

It is only on startup, and the longer it sits the worse it is - but only ever a problem if the temp has dropped to 5 degrees overnight. I agree , valve seals are a strong possibility. At first theres enough smoke to cover a house, after about 1/2 mile its considerably better, after 5 mins its clean .

ChrisG

Reply to
ChrisG

In message , SimonJ writes

Blue smoke for five mins is not normal at all for a 300 tdi.

Reply to
Marc Draper

? 2005?10?17????UTC

+8??2?04?32??ChrisG? ???

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Reply to
anyelec

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