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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Diesel slow starting

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jimfitzgerald-ia

04-26-2006 09:59:39




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I working on a 1954 Super 88 Diesel for an FFA restoration project. I bought the tractor with a worn input shaft and not running. I gone over the tractor mechanically (except motor work) and got ready to fire it up to see how it runs. I bled the diesel system according to the shop manaul (both low and high press. sides.) The tractor starts but I have to turn in over quite a while before it fires. Once it starts, it runs pretty good and the exhaust is white in color. The starter is good and I have a new battery. Did I get all the air out of the lines? I'm wondering if the lift pump is weak? Or maybe an internal valve issue? It was 70 and sunny on the day so I dont think cold weather caused any issues. Any help would be appreciated. This is the 3rd Oliver I have restored, so I am still new to the ballgame.

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dej(JED)

05-02-2006 11:26:38




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 Re: Diesel slow starting in reply to jimfitzgerald-ia, 04-26-2006 09:59:39  
A diesel has got to turn over quickly to build up ignition pressure. If you are getting fuel and you think it is cranking okay, then you have a compression loss somewhere.



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Shaun Murray

04-27-2006 06:46:21




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 Re: Diesel slow starting in reply to jimfitzgerald-ia, 04-26-2006 09:59:39  
I have a 1958 Super 88 diesel which I have completely restored. It was very slow to start until I replaced the batter cable with a 2/0 cable. Which you can get from Korves Oliver relativley cheap. You might need to charge that battery up as well. If you are taking that much juice out to start it, and only letting it run a few minutes, your battery is probably starting to get weak.

Anyway, the new cable made a tremendous amount of difference. I orginally had a brand new 2 gauge cable, which was not enough. Once again, the difference was unbelievable.

Good Luck.
Shaun

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alberta dave

04-26-2006 13:06:50




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 Re: Diesel slow starting in reply to jimfitzgerald-ia, 04-26-2006 09:59:39  
If your crank speed is slow try replacing your battery cables, they do degrade over time. Make sure you do not use welding cable for replacement.



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tom upton

04-26-2006 19:23:31




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 Re: Diesel slow starting in reply to alberta dave, 04-26-2006 13:06:50  
Just curious, what is wrong with useing welding cable for battery cables?



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alberta dave

04-28-2006 15:52:54




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 Re: Diesel slow starting in reply to tom upton, 04-26-2006 19:23:31  
I am told that welding cable is designed for up to 300 amps of current but battery cable can see upwards of 1100 or 1200 cranking amps during start-up. My company had a dozen drilling rigs built with 14L Detroit series 60 engines and all had been built using welding cable. It worked fine for the first year but by the time they were two we had repetative starting failures leading to prematurerly failed starters and excessive cranking of the engines. I found an old mechanic in Northern New Mexico who straigtened meout. Since switching to battery rated cable we have had fewer problems.

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J. Schwiebert

04-26-2006 12:58:05




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 Re: Diesel slow starting in reply to jimfitzgerald-ia, 04-26-2006 09:59:39  
Allright. How long did you run it after you bled the fuel system? Do you have good cranking speed? How good is the fuel? How long do you have to crank it before it starts to put white smoke out? Start there: Questions?



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jimfitzgerald-ia

04-26-2006 13:17:42




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 Re: Diesel slow starting in reply to J. Schwiebert, 04-26-2006 12:58:05  
I started it about 30 minutes after bleeding and just let it run for a minute or two in the shed. 3 days later, I rolled it outside and started it and drove it. The cranking speed seemed to be good (similar to our 1956 Super 88 Diesel that is fully restored and starts great). The diesel is brand new (primary filter is brand new, final filter is not new). It seems like I let the starter turn for 10-15 seconds, stopping for just a little bit and then another 10-15 turning over. I had to do that 4 times to start it (white smoke on the beginning on 2nd time) One time I turned it over once for 10-15 seconds, then pumped the lift pump priming lever 4 times and then turned it over again and it started right up.

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