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CATEGORY LISTINGS > CATERPILLAR > 3406b loss of power @ high rpm [ REFRESH ]
Thread Title:

3406b loss of power @ high rpm


Created On Friday July 23, 2010 08:59 Diesel Talk
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BOB55
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Note Friday July 23, 2010 08:59 View thread in raw text format
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3406b in 1985 Ford 190000 miles, seems to run fine at low rpm till you get up 16-1800 rpm (it's getting worse) then it cuts out totally (loss of power but stays running) with a large cloud of black smoke. It will run again at low rpm if you let off the fuel and coast a Minute of so. Fuel pressure stays around 35-40 psi. Air fuel ratio diaphragm replaced. Any ideas? Please!

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 bobjudkins
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JoeZ
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Note Friday July 23, 2010 17:38 View thread in raw text format
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Assuming you have a clean air cleaner element, and no intake air restrictions..........next thing to check would be the turbo......

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 One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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desertstormboy
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Note Friday July 23, 2010 19:15 View users profile View thread in raw text format
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double check the diaphram again, it may have torn while installing it. what about the timing advance? are the flyweights damaged or worn, maybe the orings in the advance are worn. have you noticed any stumbling or anything of that nature?


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 IT WENT BING BANG BOOM!
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BOB55
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Note Friday July 23, 2010 19:58 View thread in raw text format
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Thanks for your response. I'm going to feel real dumb (but happy) if its as easy as a air filter. I thought it should have been fine but I just checked it and it worse the I thought. First thing in the morning I'll pick one up.

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 bobjudkins
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BOB55
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Note Friday July 23, 2010 20:15 View thread in raw text format
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Thanks Desertstormboy The first diagram looked Ok but we replaced it anyway. So I would hope that's not it. I'll be a "happy idiot" if the air filter work's. I was told to check it awhile back but thought it was fine. I thought that would be too simple. If it is I'll swallow my pride and let you know.

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 bobjudkins
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desertstormboy
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Note Saturday July 24, 2010 13:40 View users profile View thread in raw text format
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no pride is high enough to not swallow....if it is the air filter, i would be a happy customer to find out it is a cheap fix and happy driver to have motor running fine again.

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 IT WENT BING BANG BOOM!
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BOB55
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Note Thursday August 05, 2010 18:52 View thread in raw text format
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Sorry it took so long to get back to thank you. Boy what a difference fresh air makes. It was the air filter, I thank it has been wet. Thanks for your responses. I've read where you've been a great help to a lot of folks. thanks again.

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 bobjudkins
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BOB55
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Note Thursday August 05, 2010 19:03 View thread in raw text format
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I wanted to let you know it was the air filter. And to thank you for your service on this site. And a special thanks to you and to all who serve our great country. I honor you.

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 bobjudkins
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