81 chevy luv wont crank

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masonandford
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81 chevy luv wont crank

Postby masonandford » Thu Nov 01, 2018 2:56 pm

Hello!
This has been a bit of a saga, i will spare the gory details. I had been having starting issues due to the prime not being held becuas se of a air leak in the fuel filter housing. That has been replaced. So has the starter that got burned out in all that cranking.
Where I'm at now has got me stumped. I'm getting lights when i cut the key one but nothing in the way of trying to turn over. The starter relay and starter are both engaging. The battery has 14 volts on it and is from this year. Today I pulled the positive battery cable to the starter, there was a bit of corrosion but no damage. I was going to make up a new one, possibly with thicker wire. This seems like the last piece of the puzzle or is there some thing that I looked over?
Please and thank you and stumped
- Mason - 81 diesel Chevy Luv 2wd
84 diesel p'up long bed 5spd 2wd RIP

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JoeIsuzu
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Re: 81 chevy luv wont crank

Postby JoeIsuzu » Thu Nov 01, 2018 3:39 pm

Are you positive you're hearing the starter relay and not a glow relay?

Just wondering if your clutch safety switch may have failed.

Jack

dorf
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Re: 81 chevy luv wont crank

Postby dorf » Thu Nov 01, 2018 4:35 pm

There are some slip connections by the pos post that connect the fuseable links

Mine used to corrode.....

Clean...repair and replace as needed

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puttputtinpup
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Re: 81 chevy luv wont crank

Postby puttputtinpup » Thu Nov 01, 2018 8:21 pm

If starter solenoid clicks but starter won't turn over, it's likely burned solenoid contacts inside the solenoid. Common issue w the diesel starters. Check your grounds at the engine and body also to rule those out

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Halden
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Re: 81 chevy luv wont crank

Postby Halden » Fri Nov 02, 2018 1:13 pm

If it were me I'd perform a voltage drop test. Then you can pinpoint be where the problem actually is. Start from the battery to the b post on the starter and close in the picture from there. Anything higher than half a volt and it can cause problems. Don't forget to rule out the ground side.
It's not pronounced "Ih-soo-zoo", it's pronounced "It-screws-you"
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FiatSpider2
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Re: 81 chevy luv wont crank

Postby FiatSpider2 » Sat Nov 03, 2018 8:26 am

Use a mechanics starter switch or just jump the solenoid to the main lug on the starter. If its turns over then your circuit between the ignition switch and starter solenoid has been stressed too. The solenoid can draw 10 amps or more and the starter itself around 2 KW on even a 4 cylinder diesel.

On my Franken Spider I was burning out solenoids until I took a 40 amp universal relay, powered it off the main lug on the starter with a 15 amp fuse inline, connected the original lead from the ignition switch to the relay and used the relay to provide more direct power from the main lug to the starter solenoid. In the years since I did that I have not burned out another starter or solenoid.
FiatSpider2 (4FB1 Isuzu Diesel powered 1978 Fiat Spider)

masonandford
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Re: 81 chevy luv wont crank

Postby masonandford » Wed Nov 28, 2018 11:35 am

hello!
Im back to it again. I replaced the positive battery wire to the starter and the wire and clip to the ignition. I've got it trying to crank but it wont turn over. I replaced the the fuel cutoff and cleaned the quick link on it and still nothing.
going nuts and need a truck
mason
- Mason - 81 diesel Chevy Luv 2wd
84 diesel p'up long bed 5spd 2wd RIP

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JoeIsuzu
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Re: 81 chevy luv wont crank

Postby JoeIsuzu » Wed Nov 28, 2018 12:04 pm

If it "won't turn over", there's no point looking at the fuel system. I'm guessing you didn't mean that. Maybe "won't fire" is what you meant?

Jack

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JoeIsuzu
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Re: 81 chevy luv wont crank

Postby JoeIsuzu » Wed Nov 28, 2018 12:13 pm

Assuming you meant "won't fire"--
Even if it's all fixed now, you have some air in the fuel system (you replaced the cutoff solenoid). There's a purge screw on the pump. I'd open it and use the hand primer (with the ignition "ON") until you can see fuel coming out the purge fitting. Somebody else may know of a better way to purge the air.

Jack

masonandford
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Re: 81 chevy luv wont crank

Postby masonandford » Wed Nov 28, 2018 12:59 pm

Could these problems be leading to injector pump problems?
- Mason - 81 diesel Chevy Luv 2wd
84 diesel p'up long bed 5spd 2wd RIP

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JoeIsuzu
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Re: 81 chevy luv wont crank

Postby JoeIsuzu » Wed Nov 28, 2018 1:15 pm

It's always best to eliminate possible issues one at a time. By working on the electrical system and the fuel system at the same time, we're now unable to determine if the solenoid was even partly to blame.

I think it's too soon to suspect a pump issue. I think we need to be sure the system will purge, and proceed from there.

Jack

masonandford
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Re: 81 chevy luv wont crank

Postby masonandford » Wed Nov 28, 2018 5:15 pm

yes that is what i mean. thanks! the shop manual has the top screw on the pump labeled as the over flow bolt. is this the one, I cant find a specific bleeder screw. thanks again

mason
- Mason - 81 diesel Chevy Luv 2wd
84 diesel p'up long bed 5spd 2wd RIP

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Paul
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Re: 81 chevy luv wont crank

Postby Paul » Wed Nov 28, 2018 11:49 pm

JoeIsuzu wrote:Assuming you meant "won't fire"--
Even if it's all fixed now, you have some air in the fuel system (you replaced the cutoff solenoid). There's a purge screw on the pump. I'd open it and use the hand primer (with the ignition "ON") until you can see fuel coming out the purge fitting. Somebody else may know of a better way to purge the air.

Jack


Jack - -

The ignition doesn't need to be on to purge air from the pump. Any air in the pump will be purged through the return fuel fitting (or fuel purge screw) when the hand primer is stroked (if it works, not too likely). Turning the ignition on will only lead any air to nowhere as all of the injectors will remain closed (which is just as well as it takes a lot of cranking to purge air from the hi pressure injection lines).


================================

mason - -

If the engine will not turn over with the starter, I would try to turn it over by pushing the truck in 4th gear to make sure the engine is not frozen. If not frozen then check the voltage on the starter motor (as Halden suggested). If it is 8 volts or more and not cranking, I think you likely have a bad starter.

Also, if you have a DC clamp-on current meter it will be informative to know how much current the starter is drawing.

The air purge screw is located on the end of the fuel return fitting, on the rear side of the pump. The screw need only be loosened a couple of turns as it has a special spiral groove cut in it to allow purging without total removal.

Paul
'84 P'UP 2 wd diesel, 5 spd with 0.78 fifth gear and differential back to 3.73.

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JoeIsuzu
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Re: 81 chevy luv wont crank

Postby JoeIsuzu » Thu Nov 29, 2018 6:28 am

Thanks, Paul. I was under the impression that the fuel cut solenoid needed to be open.

Jack

masonandford
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Re: 81 chevy luv wont crank

Postby masonandford » Fri Dec 28, 2018 6:40 pm

thanks for all the tips. Its running like a top now. the fuel cut solenoid wasn't getting voltage (bad wire).
mason
- Mason - 81 diesel Chevy Luv 2wd
84 diesel p'up long bed 5spd 2wd RIP