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well, this may only help a little, but go the the website listed below and click on 'our trucks' and click on the m-621 page. i have not drained the tanks in 8 years because the drier gets it all!! unit is from a UD (nissan) box truck. tom

if you don't like 'screamers' then you won't like the 002 or 003. listen to one in person before you buy.

he already knows the wheels turn, it is the carrier that does not turn. pull the drain plug and see what comes out. in almost any case the unit will have to come apart.

in that case why would it not roll with the engine off? i assume it will not.

wow! i must be lucky then. out of 13 they all run and generate even though them have multiple other problems including missing sheet metal, (i'm having some made as i cannot find it) however i did pay a lot for them and inspected them carefully before bidding. i saw so many that i just would not...

wrong model so doesn't count, plus it runs

or they could both be bad, we are talking about old units here.

well as you know, when the mark in the window lines up, the ip does not want to sit there unless you hold it. glad it was all so simple, well some of it anyway!! tom

have you checked it with a known good gauge? a mechanical one right on the engine?

well i remember there were some questions quite a while age about tank removal. really there should never be a reason to remove the tank, the fittings are not made in the tank, but are expanding rubber plugs that are easily replaceable from outside. however i needed to remove the radiator end...

was wondering how many people still have not gotten 802 or 803 up and running? after the big batches of old units that could have been sitting for years, just wondered. i got 2 803 that probably had not run in 15 years since they had no hours on them and dried up fuel in system, one did not...

is your toe-in at least 3/16"??

i would say bad v-reg. it is a sealed unit that is external on the back of the alt. just remove it and energize the field or remove the alt and check the diodes. it is very simple to work on.

that's a little over kill!!

yes, i wouldn't make any long trips with it until you find the problem and that will probably require head removal.

well, regardless of the settings it should start if you hold the throttle open as on the floor which you should do anyway to assure max fuel. i know you know how to install one, but it is easy to verify you don't even have to take the valve cover off if you read the manual, cause i don't...

was this a known good HH? that is classic worn out HH.

there is a hole near the center of the head, 3/8" maybe?

i used a large eye bolt and welded the joint in the eye shut

you zero the meter you are using, then measure the resistance. no further math needed.