Excessive Blowby - Ford Powerstroke Diesel Forum
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Old 03-31-2008, 12:01 PM
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Excessive Blowby

Greetings ... new to this forum. Been looking through the forum for the answer but still not sure.
Problem; Truck was ranning well until a Push rod broke. Replaced the pushrod and started truck. Engine has a definate miss on one cylinder. Number 6 is the suspect as it had the broken pushrod. There is enough crankcase pressure to blow oil up the dipstick when reved to over 1800 RPM. Exhaust has only a slight white smoke to it. Engine starts ok, idles rough, reves up, Fuel pressure is good 60#. Left bank tube has oil in it that came from the CCV.
2000 F450
Thanks .... Ken Gardner

Last edited by akghound; 03-31-2008 at 12:28 PM.
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Old 03-31-2008, 01:16 PM
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if you have enough pressure to blow up the dipstick, is your CCV plugged?
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Old 03-31-2008, 01:24 PM
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Either that or possible hole in piston? Had that happen with a gasser once.
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Old 04-01-2008, 07:22 AM
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Quote:
Originally Posted by afbluesv1k View Post
if you have enough pressure to blow up the dipstick, is your CCV plugged?
It is OK I took the tube off of the air box and checked it out. Seemed to have a lot of CC pressure coming from it as well.

Could this much blowby come from just one dead cylinder? I hope there is not a hole in the piston
We will have a scanner available in the next couple days to figure out just why this cylinder is dead.
Ken Gardner
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Old 04-02-2008, 05:38 PM
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if the injector isnt fireing then your rings are not seating allowing all your air to push past the piston
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Old 04-04-2008, 07:32 PM
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Melted piston

Scanned engine and #8 showed up in the contribution / balance test. Pulled the glowplug and blew air into the cylinder and straight through to the crankcase. Pulled the head and found a huge hole in the piston. It had melted down around the 2-oclock position. Very little damage to the cylinder wall, thank God. Piston #2 is showing signs of burning out as well. Looks like a rebuild is in store. Ouch that hurts! At lease it happened now instead of during the Fire Season when the truck can be making money. Trouble is last Fire Season is so far away that I'm broke. No money but lots of time so I'll be doing the wrenching myself, no big deal. Any inexpensive tricks I should do while the engine is out of the truck? Just replaced the Tranny and transfer case, new breaks. Before long this truck will be like new but right now it feels like Fix Or Repair Daily!!
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Old 04-08-2008, 06:33 PM
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#8 burned out

#8 piston burned through.


#2 damaged



Haven't taken the right side hear off yet.
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Old 04-15-2008, 10:21 AM
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Update

Pulled the right side head and at a quick glance it all looks OK. I want to add Exhaust gauges, pre-turbo. What are you guys using for the gauge? Duel needle? Where would you put the sensors, thermocouples?
Here is a picture of my #8 piston.

Thanks Ken Gardner
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Old 04-15-2008, 12:53 PM
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no longer URGENT

Since this is no longer urgent I started a new thread here http://www.powerstroke.org/forum/7-3...-meltdown.html I still need advise
Thank you .... Ken Gardner
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Old 08-23-2010, 02:31 AM
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holy crap batman

how did that happen. and a bent pushrod?? how would a stock engine get so hot???
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