lot of blow-by on 7.3 - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 04-29-2011, 10:21 PM Thread Starter
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lot of blow-by on 7.3

I have a 95 f250 4x4 with blow-by --- how much is to much blow-by -- it has a 7.3 psd with a K&N air intake, 4" exhaust, and a preformance chip-- it starts very good ( summer or winter ) with no smoke from tailpipe at all it idles and drives real good sounds good at tailpipe has a lot of power ( runs like a raped ape and will burn the tires ) --- BUT, when i take of the oil cap it smokes like a chimney ( it does not spray any oil mist ) i then can set the oil cap on and it will set there --- is this motor worn out? do i need a new truck? it has 238,000 mi. anyone know a good junkyard?
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post #2 of 3 Old 06-11-2011, 01:18 PM
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I don't know but my '99 f350 with 318,000 looks like a locomotive when I take the oil cap off. It runs great, no smoke from the tail pipe, no oil mist. Does the truck need rings? Can anyone else chime in?

'99 Ford F-350 dually, Crew Cab 4x2 w/ 7.3L (Totaled- rebuild coming soon)

'01 Ford F-250 Crew Cab 4x4 shotbed w/ 7.3L

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post #3 of 3 Old 06-11-2011, 02:06 PM
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thats completely normal. your trucks under little/no boost situations are low compression diesels. If you can set the cap on there and it doesn't blow off from crank case pressures (not to be confused with vibrating off), its completely normal. do not freak out. its a turbo diesel thing


First rig: e99 F250 CCSB 4x4 auto, white, 388k miles: traded in
Then: 02 F350 RCLB SRW 4x4 zf6, silver, 201k miles, THREW A ROD : traded to Jake
Now: 96 F350 CCLB DRW 4x2 auto, red and silver/grey, 266k miles: rusty but trusty
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