Search found 176 matches

by rid54
Tue Sep 10, 2019 10:37 am
Forum: DBTC Forum
Topic: DB 880 Selectamatic
Replies: 3
Views: 136

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: 572

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: 791

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: 791

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: 791

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: 690

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: 690

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: 1408

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: 1745

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...
by rid54
Wed May 08, 2019 8:23 pm
Forum: DBTC Forum
Topic: How to loosen this bolt witout breaking the lifting arm
Replies: 12
Views: 1096

Re: How to loosen this bolt witout breaking the lifting arm

I suppose there are people here who know exactly what the material is in the "arm", but I'd guess it is forged, not just a cast. Heating it for the purpose of loosing the bolt shouldn't harm it really, not unless you're aiming at red hot heat. The idea with heating things, is to loosen the bond crea...
by rid54
Sun May 05, 2019 4:13 pm
Forum: DBTC Forum
Topic: DB 1200
Replies: 18
Views: 1745

Re: DB 1200

Inline pump or distributor-type pump? First step is to ascertain that the lift pump pumps enough fuel while cranking the engine, then bleed filters and injection pump. Is there no fuel coming out even from the injection pump delivery holes? (except for #4)
by rid54
Fri Apr 26, 2019 5:11 pm
Forum: DBTC Forum
Topic: Dynamo and regulator wiring
Replies: 32
Views: 2130

Re: Dynamo and regulator wiring

I really don't know, but a 6 to 12 V inverter, capable of handling something like 30 A sounds like an expensive item. And, as was suggested by Gard, not totally reliable in the setup (if the thought was to convert dynamo output to 12 V). A really good 6 V battery shouldn't be more expensive, I'd gue...
by rid54
Fri Apr 26, 2019 8:35 am
Forum: DBTC Forum
Topic: Dynamo and regulator wiring
Replies: 32
Views: 2130

Re: Dynamo and regulator wiring

I would suggest keeping the 6 V system, now that you have got the dynamo working. The only drawback is (possibly) a battery that is overpriced, but a quality unit should last several years if kept fully charged. Of course, 6 V systems require state-of-the art wiring and connections of the main circu...
by rid54
Thu Apr 18, 2019 11:01 am
Forum: DBTC Forum
Topic: Dynamo and regulator wiring
Replies: 32
Views: 2130

Re: Dynamo and regulator wiring

...But the main thing is it shows the connections between dynamo and regulator and I can now dismantle mine to compare. My dynamo definately has 3 wires exiting, but that diagram shows 2 plus a small wire ending in an arrow - does this mean to earth? It appears to be inside the dynamo on the drawin...
by rid54
Wed Apr 17, 2019 9:26 pm
Forum: DBTC Forum
Topic: Dynamo and regulator wiring
Replies: 32
Views: 2130

Re: Dynamo and regulator wiring

I think your ideas are all sound. What you need to do is to find the proper relationship between the connections from the dynamo itself and the regulator. It may indeed be worth while to take the unit off of the tractor and examine it thoroughly, or take it to an electrician with the required knowle...