Le Tonkinois Varnish

B & D Murkin

UK main importers for

Le Tonkinois varnish

Flexidisc sander

Faulty Components

A few component failures lead to a better understanding of how parts work or come apart, other failures may be just interesting.

Used Airtronic D4 burner that we bought cheaply on Ebay, no reason was given why it had been replaced. Disintegrating mesh and solid carbon deposits show the burner was possibly already starting to fail. A D2 burner will be smaller but with similar construction. Burner faults can only be determined by substitution with a known good one. Full details and pictures are on the burner autopsy page.

Melted akp hose caused by a break in the inner core allowing hot air into contact with the plastic outer covering. Probably caused by being bent too often or too much. Sections of the inner hose fell apart during removal.

New Airtronic D2 screen with one removed and taken apart, showing the screen has 5 mesh layers. Screen can look clean externally but be clogged to failure point.

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Soft pipe kinked blocking the fuel supply.

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D1L Heat exchanger which contained the faulty burner. Upper left is where the part with the fuel pipe fitted. That joint would have had to be broken to remove the burner. Photo shows the area behind the burner that is normally hidden and cannot be accessed for mechanical cleaning.


Simple items are usually not of much interest but they are just as effective in causing the heater to fail.


Corrosion in barrel type fuseholder.

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The faulty combined sensor left with its replacement right. The wiring terminals on the sensor sensor show it must have been mighty hot. The faulty overheat sensor is the red-brown glass diode type package centre top, its wires are also blackened.

Novel exhaust port repair using a socket spanner shown on a Russian site!

Our site has a page on fixing damaged ports

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New exhaust silencer and one clogged up with white deposits.

Full details and pictures are on the silencer autopsy page.

Airtronic D2 ECU double sided circuit board after sealant removal.

More details and pictures of this and other heater's ECUs on the ECU autopsy page.

Another burner from a D1L with severe damage to the main burner parts which was not caused by dismantling. The part on the extreme left had to be separated from the burner to remove the burner.

More detail of the above burner.

The metal has been burnt through.

The case of this D2 was crushed causing it to touch the impeller resulting in a severe overheat lockout. The overheat sensor (next photo) was damaged but surprising the ECU survived as did the blower except for the loss of it's magnet, replaced for £0.99 from Ebay. See blowers page for repairing blower motors.

Photos John Martin

Disintegrating exhaust pipe.

Leaks are often hidden under insulation.

Photo Jon Welford.

Corrosion on poor quality skin fitting.

Photo Jon Welford.

This D3WZ has seen better days.

Probably the one 'repaired' in next photo.

D2L faulty Motor control board.

Original fault cause was the connector with the brown wires. Here all the six soldered connections to the circuit board have fractured. There was also evidence of corrosion on some connectors. The brown stain and blob was not significant.

Oxidised wires causing bad connections.

Wires stripped back more than 50 mm still oxidised. Bright copper on some wires was caused by the wire strippers.

Badly clogged D1LCC Glowpin screen. Much of the surface carbon broke away whilst removing. Bending damage done during removal. New screen lower right.

Hole burnt through D5WZ screen.

Photo www.juergen-greiner.de

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Mechanically jammed D3L pump inlet pipe completely blocked by a hard green deposit.

Sand like grains in the fuel filter caused by water.

Loose strand of wire touched red wire and blew fuses when the cables were moved. This is a common cause of wiring faults with multi strand wires.   Photo Chris Hardcastle


D3LC screen in similar condition.

Very badly clogged at base meant it was unable to be removed intact.

Photo Rob French.

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Degraded fuel with a low cetane rating caused this D5WSC to clog up and fail within a month of a full service.

Smelly fuel soaked soot, very soft, much would have fallen off during removal.

Photos Craig Cheek


Glowpin from an alternative diesel heater. First ceramic glowpin failure I have seen. Photo Patrick Houston

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