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Re: 235 won't start [Re: MontanaLee] #1334268 Mon Nov 18 2019 11:05 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
What is the cranking speed with the spark plugs removed? It should spin noticeably faster with the compression relieved. If not, there's too much drag somewhere- - - -rusty cylinder walls, tight bearings, too-thick oil, etc. What temperature is the engine? If the truck is parked outside in very cold weather, it might be necessary to do a 12 volt jump start, but I've seen lots of 6V vehicles start reliably even in sub-zero weather. Did you load test that "new" battery? It should deliver 250-300 amps for 15 seconds without dropping the terminal voltage below 4.5 volts.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 235 won't start [Re: MontanaLee] #1334272 Mon Nov 18 2019 11:13 PM
Joined: Sep 2019
Posts: 42
M
MontanaLee Offline OP
Wrench Fetcher
will check cranking speed with plug removed tomorrow. oil probably needs changing bit is only been in the 30's not terrible cold. The truck is inside but not heated. I will look at a 12 volt jump tomorrow as well. I did load test the battery before I replaced the starter and with ignition off, voltage was 5.6 volts while cranking. How best to jump start with 12 volt.


1948 3/4 ton Chevy Pickup
Re: 235 won't start [Re: MontanaLee] #1334278 Mon Nov 18 2019 11:34 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
You'll get a pretty healthy flash from the booster cable as you attach the last connection because of the mismatch in battery voltage. I always make the ground cable connection last, as far away from the battery as possible to prevent any danger of getting a hydrogen gas explosion. Don't crank with the 12 volts attached for more than 10 seconds or so to prevent any damage to the coil, points, etc. Disconnect the 12V jumper as soon as the engine starts.

One thing I've done while waking up a 6V engine after a long sleep is to install a 12V coil temporarily and use a 12V battery to do the initial startup, run-in and tune up. Just disconnect the Battery wire at the voltage regulator to prevent doing any damage to the charging system, and leave the lights and other 6V accessories turned off. Once it's starting and running reliably, you can swap back to 6V operation.


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 235 won't start [Re: MontanaLee] #1334471 Wed Nov 20 2019 03:00 PM
Joined: Sep 2019
Posts: 42
M
MontanaLee Offline OP
Wrench Fetcher
is it important to turn the engine over with spark plugs removed, before I jump start it with a 12 volt battery?


1948 3/4 ton Chevy Pickup
Re: 235 won't start [Re: MontanaLee] #1334472 Wed Nov 20 2019 03:03 PM
Joined: Sep 2019
Posts: 42
M
MontanaLee Offline OP
Wrench Fetcher
to be clear jump start with 12 volt in lieu of removing the plugs to see how it turns over. keep in mind it ran very well 2 weeks ago, just a little sluggish starting but fired off, now it turns very very very slow.


1948 3/4 ton Chevy Pickup
Re: 235 won't start [Re: MontanaLee] #1334477 Wed Nov 20 2019 03:41 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
The test with the spark plugs removed is important, because jump starting with 12 volts can hide a tight rotating assembly. If the pistons and/or bearings are too tight you really don't want to make the problem worse by forcing the engine to turn with high starter torque.

We're swimming upstream at this point because apparently some preliminary steps like pre-soaking the cylinders with lightweight oil or Diesel fuel, etc. apparently was not done prior to trying to start the engine. I usually spend a week or more checking the basic mechanical condition of an engine before I make any attempt to start it. That includes lots of pre-oiling, soaking the cylinders and valve guides with something like PB Blaster or KROIL, compression testing, spinning the engine at no load with the spark plugs removed, etc. Actually making the engine fire and run on its own is the dessert course of a meal- - - - -not the appetizer!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 235 won't start [Re: MontanaLee] #1334494 Wed Nov 20 2019 06:35 PM
Joined: Sep 2019
Posts: 42
M
MontanaLee Offline OP
Wrench Fetcher
what is better KROIL OR pB Blaster


1948 3/4 ton Chevy Pickup
Re: 235 won't start [Re: MontanaLee] #1334498 Wed Nov 20 2019 07:01 PM
Joined: Sep 2001
Posts: 28,886
tclederman Offline
Boltergeist
hmmm . . .

That is a lot like asking "which religion is better"?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: 235 won't start [Re: MontanaLee] #1334499 Wed Nov 20 2019 07:03 PM
Joined: Sep 2001
Posts: 28,886
tclederman Offline
Boltergeist
hmmm . . .

That is a lot like asking "which religion is better"?

links to comparison tests


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: 235 won't start [Re: MontanaLee] #1334520 Wed Nov 20 2019 09:23 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
I've used KROIL for over 40 years- - - - -don't see a reason to change now. Besides- - - -it's a Tennessee product, made about 60 miles North of my place. I'm also 30-something miles from Lynchburg, home of Jack Daniel's! Guess what's in the liquor cabinet?

www.kanolabs.com

Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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