Search found 210 matches

by rid54
Sun Jun 07, 2020 1:02 pm
Forum: DBTC Forum
Topic: 880 Selectamatic overheating
Replies: 6
Views: 216

Re: 880 Selectamatic overheating

According to your description, the engine will not overheat when the thermostat is out, but it overheats with a functioning thermostat installed.
Can the thermostat be mounted in "the wrong way", if you excuse me for mentioning this?
Can you verify that the water pump is in good working condition?
by rid54
Tue May 19, 2020 2:49 pm
Forum: DBTC Forum
Topic: 780 Polarity - Always Negative Earth?
Replies: 8
Views: 358

Re: 780 Polarity - Always Negative Earth?

If the dynamo isn't damaged (burnt winding or so) there is no reason to believe it shouldn't be useful with a good regulator. There is a procedure for pre-polarizing it, so the remanent magnetism is "the right way around" for the correct polarity. The regulator (control box) on the other hand, must ...
by rid54
Mon May 18, 2020 8:22 pm
Forum: DBTC Forum
Topic: 780 Polarity - Always Negative Earth?
Replies: 8
Views: 358

Re: 780 Polarity - Always Negative Earth?

I suppose you could check the system by disconnecting the dynamo and the control box/regulator completely and hook up the battery the right way around (neg. earth). If the battery is charged, the indicator lights, instruments and starter should work. I would then suspect that the regulator is damage...
by rid54
Sun May 10, 2020 2:55 pm
Forum: DBTC Forum
Topic: 880 lazy starter (selectamatic)
Replies: 8
Views: 405

Re: 880 lazy starter (selectamatic)

Additional on batteries:

A normal 12 V lead-acid battery should be charged to 14,4 V, and that's what is the normal switch-off voltage for "intelligent" chargers. After several hours of rest, with no charge or discharge, a good battery will show around 12,7 V if it is healthy.
by rid54
Sat May 09, 2020 5:43 pm
Forum: DBTC Forum
Topic: 880 lazy starter (selectamatic)
Replies: 8
Views: 405

Re: 880 lazy starter (selectamatic)

At some point I acquired a file with all the repair instructions for DB electric equipment - this was from a link shown in this forum. I really do recommend you try to find that one, it is very useful and full of data. The diesels have pre-engaged starters, whereas the petrol/whatever (Otto engines)...
by rid54
Sat May 09, 2020 8:08 am
Forum: DBTC Forum
Topic: 880 lazy starter (selectamatic)
Replies: 8
Views: 405

Re: 880 lazy starter (selectamatic)

I think you will be able to achieve good results going over the starter yourself. All contact surfaces (contacts in the solenoid and cable connections) are important of course. There may also be specialized instructions for the commutator: some makers recommend going over it with fine glass or emery...
by rid54
Sat Apr 18, 2020 8:14 pm
Forum: DBTC Forum
Topic: 990 Cylinder Head
Replies: 17
Views: 1723

Re: 990 Cylinder Head

Firstly: The compression may be down, if the engine turns over lightly, but to ascertain any problems, a compression test must be performed. Secondly: The speed of a diesel engine is determined only by the amount of fuel injected. There is no throttle valve and no metering of the intake air, so ther...
by rid54
Sat Apr 18, 2020 4:30 pm
Forum: DBTC Forum
Topic: 990 Cylinder Head
Replies: 17
Views: 1723

Re: 990 Cylinder Head

If the valves do not hit the pistons (or vice versa), the pistons should be OK, I'd guess. Bad speed regulation shouldn't be a problem with the head, but rather with the injection pump (regulator not working properly).
by rid54
Wed Apr 08, 2020 7:20 am
Forum: DBTC Forum
Topic: 880 Selectamatic Dynamo
Replies: 17
Views: 1987

Re: 880 Selectamatic Dynamo

By using a multimeter measure the output of the dynamo at B+. If you are not getting over 13v at that point your dynamo is faulty. Do not try to adjust your regulator unless you know your dynamo is working properly as designed. your workshop manual should tell you how to test the output of the dyna...
by rid54
Tue Apr 07, 2020 4:11 pm
Forum: DBTC Forum
Topic: 880 Selectamatic Dynamo
Replies: 17
Views: 1987

Re: 880 Selectamatic Dynamo

I would strongly suggest measuring the dynamo windings, and also ascertaining that it does not have any kind of irregular connection system (being of another brand than the original, apparently). If the armature or the field windings do not have continuity, the dynamo is defective. If the windings a...
by rid54
Sun Apr 05, 2020 9:49 pm
Forum: DBTC Forum
Topic: 880 Selectamatic Dynamo
Replies: 17
Views: 1987

Re: 880 Selectamatic Dynamo

I think one would expect the field winding and the armature both to have one end connected to the dynamo case = negative pole = "earth". Field current is fed to the F or DF terminal and at D+ the output is collected. Field connector and D+ (or just D) should have continuity to ground/case/earth, mea...
by rid54
Sun Apr 05, 2020 3:16 pm
Forum: DBTC Forum
Topic: 880 Selectamatic Possible Overheat
Replies: 9
Views: 558

Re: 880 Selectamatic Possible Overheat

With the infrared thermometer, measure the temp of the head and the block. The gauge may be faulty or not suited to the sensor.
by rid54
Sun Apr 05, 2020 2:35 pm
Forum: DBTC Forum
Topic: 880 Selectamatic Push-Pull Fuel Tap Seal
Replies: 5
Views: 361

Re: 880 Selectamatic Push-Pull Fuel Tap Seal

It might be the easiest way to drain the tank through the valve body. After the core is withdrawn, the fuel will escape through a hole, over which a hose may be quickly fitted (assuming a proper size hose has been found first) and then led into a suitable container. Been there, done that.
by rid54
Sun Mar 22, 2020 8:00 am
Forum: DBTC Forum
Topic: Dead Clutch Pedal
Replies: 12
Views: 569

Re: Dead Clutch Pedal

The lever that sits on the cross-shaft looks to be clamped in position. Perhaps the joint has slipped, if the clamp has been loosened and the lever now sits in the depressed position while the cross-shaft is still in the normal position. that might be easily checked I suppose but needs hands-on, of ...
by rid54
Sat Mar 21, 2020 4:34 pm
Forum: DBTC Forum
Topic: Dead Clutch Pedal
Replies: 12
Views: 569

Re: Dead Clutch Pedal

In the video I think one can see the pedal moving, but the cross-shaft doesn't follow the movement. If there is a pin securing the lever to the cross-shaft, it may have been sheared or lost. That would be a simple problem to solve. However, no info is gained about the clutch mechanism - it may have ...