Search found 182 matches

by rid54
Sat Nov 02, 2019 3:31 pm
Forum: DBTC Forum
Topic: Electrics
Replies: 4
Views: 179

Re: Electrics

Something is obviously amiss here. The warning lights are all fed with +12 V when ignition switch is in the "run" position. They should all glow "brightly" at that point, as long as the engine is not started. With ignition turned "off", they should all go out. The lamps are grounded by their respect...
by rid54
Wed Oct 30, 2019 10:11 am
Forum: DBTC Forum
Topic: Injection Pump Inlet Filter
Replies: 24
Views: 1092

Re: Injection Pump Inlet Filter

The feed pressure from the lift pump is determined by the return spring in the lift pump, the status of the filters, and the flow ratio through the injection pump. Unless the lift pump is bad or the filters clogged, the pressure itself should be good enough for the injection pump to work on. The ret...
by rid54
Sat Oct 26, 2019 5:08 pm
Forum: DBTC Forum
Topic: Case 1494 Alternator
Replies: 3
Views: 218

Re: Case 1494 Alternator

The voltage across a "12 V battery" in good condition is around 12.6 V when it is in a "neutral" environment (no charge, no load). The "ALT", or charge warning light, goes out when the alternator can supply itself with excitation voltage, that is when it has "woken up", so to speak; it gives no info...
by rid54
Sun Oct 20, 2019 4:11 pm
Forum: DBTC Forum
Topic: Ruined Fuel - 885
Replies: 5
Views: 310

Re: Ruined Fuel - 885

On my 880, there is a smallish metal net inside the lift pump. Check and clean if there is one in yours. Try blowing backwars in the fuel line from the lift pump into the tank. See where bubbles appear. If there is a blockage it should be evident. If there is a shutoff valve, perhaps the passages in...
by rid54
Wed Oct 09, 2019 3:27 pm
Forum: DBTC Forum
Topic: Injection Pump Inlet Filter
Replies: 24
Views: 1092

Re: Injection Pump Inlet Filter

If you get a nice flow into the injection pump by turning the engine, indeed the lift pump and the filters should be OK. In that case I would suspect that the final filter in the injection pump inlet actually does need inspection. Not having access to full info, I would nevertheless assume that part...
by rid54
Tue Sep 17, 2019 2:41 pm
Forum: DBTC Forum
Topic: 1390 Starter Problem
Replies: 4
Views: 338

Re: 1390 Starter Problem

If possible, measure the voltage on the "motor side" (not the battery side) of the solenoid contacts as you try to start. If the voltage is >10 V but the starter is sluggish or not turning at all, you may have problems with the starter motor brushes. If the voltage is < 6 V, the solenoid contacts ar...
by rid54
Tue Sep 10, 2019 10:37 am
Forum: DBTC Forum
Topic: DB 880 Selectamatic
Replies: 3
Views: 378

Re: DB 880 Selectamatic

Is the new gauge suitable for the sender in the engine? I think there are a few different standards out there for sender resistance at hot or cold temperatures.

75-80 centigrades seems like an OK system temp after a while. My 880 takes a long time to get warm under light loads (the thermostat is OK).
by rid54
Sun Sep 01, 2019 11:32 am
Forum: DBTC Forum
Topic: 880 Selectamatic Dynamo
Replies: 9
Views: 874

Re: 880 Selectamatic Dynamo

I am fairly convinced you should be able to measure the output voltage of the dynamo as the engine is idling (approx 700 rpm, I think) and see what happens when you increase revs. Normally, one would expect sligthly below 12 V (rising with the engine speed) until engine reaches 800-900 rpm, then the...
by rid54
Fri Aug 02, 2019 7:05 pm
Forum: DBTC Forum
Topic: If it's not one thing it's another. 885 starter drive #
Replies: 17
Views: 1139

Re: If it's not one thing it's another. 885 starter drive #

I'm sorry if I cause confusion, but I have dealt with starters a few times. The Bendix variety is the one that relies on rotational inertia to engage the starter motor gear into the ring gear of the flywheel. The gear on the starter pinion is shaped like a sleeve that has a spiralling groove inside ...
by rid54
Fri Aug 02, 2019 7:34 am
Forum: DBTC Forum
Topic: If it's not one thing it's another. 885 starter drive #
Replies: 17
Views: 1139

Re: If it's not one thing it's another. 885 starter drive #

Bendix:
https://en.wikipedia.org/wiki/Bendix_drive
an engagement mechanism for a starter motor drive gear
by rid54
Thu Aug 01, 2019 8:41 pm
Forum: DBTC Forum
Topic: If it's not one thing it's another. 885 starter drive #
Replies: 17
Views: 1139

Re: If it's not one thing it's another. 885 starter drive #

Where I live, starter motors and generators (dynamos, alternators) are usually a specialist-type component; that is, you find a specialist shop that deals with these things irrespective of their heritage, so to speak. Motorcar, marine, tractor... these firms know the ins and outs of whatever you put...
by rid54
Mon Jul 15, 2019 4:43 pm
Forum: DBTC Forum
Topic: hand crank start 900?
Replies: 10
Views: 922

Re: hand crank start 900?

Hand crank start of a petrol engine is performed with just a ½ turn of the crankshaft, in the final, actual starting attempt. The cylinders should first be "primed" by a few complete turns with ingition off, filling them with combustible petrol/air mixture. Hand crank start of diesel engines is not ...
by rid54
Sat Jul 13, 2019 6:19 pm
Forum: DBTC Forum
Topic: hand crank start 900?
Replies: 10
Views: 922

Re: hand crank start 900?

It is not going to hurt the engine trying to start it with a hand-crank, but unless done in the right way, it could be a bit dangerous to the operator. Normally, assuming an electric-ignition engine, one would start by turning the engine with ignition off, a couple of turns. If the engine is cold, t...
by rid54
Wed Jun 12, 2019 8:01 am
Forum: DBTC Forum
Topic: Spun bearing on 990
Replies: 15
Views: 1706

Re: Spun bearing on 990

Since we're in the realm of opinion here, I venture mine: Taking out one of the cylinders will put some extra stress on the crankshaft, as it increases variations the rotational forces. The torsional stress on the crankshaft will increase and, in an unlucky event, torsional resonance might appear at...
by rid54
Wed Jun 05, 2019 7:35 pm
Forum: DBTC Forum
Topic: DB 1200
Replies: 18
Views: 2071

Re: DB 1200

Shut-off not working? Seems a bit odd, as it is almost like a safety feature. You may have to ascertain that movement of the knob/lever actually corresponds to proper movements of the lever(s) on the pump housing. I do not know what pump type is on your engine. Rotary pumps ("distributor-type") shou...