Deutz — Testing the Heating Tube or Flame-type Heater Plug
Testing & diagnosis
From a Deutz owner's manual covering: F 3L 912, F 4L 912, F 5L 912, F 6L 912, F3L F4L F5L F6L. Check it applies to your exact model before use.
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Procedure
- Preheat approx. 1 minute with heater plug/starter switch in position 1.
- A distinct warming up of the heating tube close to the electric line connection must be felt by hand.
- For flame-type heater plug, heater plug indicator must brightly light up.
- To check fuel supply, loosen pipe coupling of flame-type heater plug by a few turns.
- Without preheating, switch at once to position 2 to turn engine by starter motor; fuel must emerge at slackened pipe connection.
- If no fuel emerges, remedy in shop.
- If engine fails to start despite fuel emerging, remove flame-type heater plug and check for free flow.
Specs & values
- Preheat approx. 1 minute
Source: Deutz owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.