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Cummins big cam three heads in a 1984 peterbilt, Diesel leaking between the front and middle head when running.

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  • Anonymous Mar 21, 2014

    when its above 36 degrees f my peterbilt will heat on hills have changed rad,fan,water pump,thermostats,oil cooler,injectors,turbo pushes 30#. have one oil filter,one one inch hose on bottom of raditor,good schroud and eight blade fan. frustrated



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Thes engines have fuel jumpers that carry fuel from the #1 head to the #2 head and from #2 to #3. these are steel lines and use o rings to seal on the head. these orings will leak sometimes, but usually something has gotten between the rocker box and the line and rubbed a hole into the line.

Posted on Jan 14, 2011


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N14 cummins in a peterbilt getting large amounts of fuel in the oil. Replaced the pump heads and injectors and still doing it ?im told that is all it can be

Common problem on this engine and the current solution is to constantly change the oil to prevent overflow and then inter your DPF system if you have one.

One thing to try is have your computer re-programmed, but no guarantee it will solve your problem.

Dec 23, 2016 | Cars & Trucks

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How to remove cyl heads

Buy a chiltons manual that's specific the the cyl heads your trying to remove. I'm guessing your talking about heads on a car ? By not including a make, model, year , engine size , diesel or gas, overhead cam, naturally aspirated, turbo, fuel injected, carbureted there is no way to answer the question you are asking. Your biggest concern should be on how to reinstall them. Reinstalling heads are far more complex than removing them. All heads are different in the pattern in which they are tightened down ( to prevent warping ) . A specific amount of torque must be applied to each bolt. Some bolts require thread sealant because they pass through the water/coolant passages in the engine. Failure to do that will result in water leaking into you combustion chamber thus ruining your engine as well as your new head. Also the thickness of the head gasket must be correct because to thin or to thick of a gasket will change your engines compression ratio . The gasket thickness can also change your cc's in the combustion chamber. A gasket that's to thin can also allow the exhaust or intake valve to hit the top of the piston on the compression stroke. If your dealing with an overhead cam or dual overhead cam engine then the proper setting of the camshafts when reinstalling the head or heads is crucial . The above only pertained to gas engines. If you have a Diesel engine then things change dramatically . The pressures in the cylinder head combustion chamber area on a Diesel engine is unbelievable . One small mistake or oversight on reinstalling a head on a Diesel engine can be catastrophic .

Aug 09, 2013 | Cars & Trucks

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Cylinder head bolt torgue settings for sprinter 312D 1999

As this is a diesel then the settings are higher than a petrol engine Now according to my alldata book its 60nm slacken 90? then 20 nm which i find confusing ,now back to basics here if a cast iron head with a turbo then 120lbs ,usual start in the middle and work alternatly outwards ,firstly with a rachet tighten down a bit which will give about 40lbs then the bar and slight grunt this will give about 80/90lbs then the torque wrench to the setting ,by pulling it down in three stages this will ensure the head is pulled down equally without damaging the gasket ,seen this before so i always do it in three stages .Unless you have a the big multi socket air powered factory tool like on the assembly line

Nov 29, 2012 | Mercedes-Benz Cars & Trucks

1 Answer

Water getting in oil of a 400 cummins big block

Leaking head gasket, cracked head or engine block

Aug 09, 2012 | Cars & Trucks

2 Answers

Where do the vacuum hoses go from the control 1999 Dodge Pickup

first ... Make sure that you have vacuum to your control head. This is normally the black vacuum line. The vacuum than goes to the various vacuum motors on the Heater /AC case. These vacuum motors rarely fail. The normal fault is loss of engine vacuum ..cut line or not secure to engine. second.. a fault with the vacuum reserve reseviour. When the engine needs the vacuum this is your vacuum supply.

Apr 25, 2010 | 1999 Dodge Ram

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2001 dodge 2500 diesel oil leak in front of power

The power steering pump is piggie backed to the vacuum pump. The seal in the back of the vacuum pump has engin oil under presure behind it cousing a leak that gets worse over time. Cummins make a seal kit to fix this leak.

Dec 26, 2009 | 2001 Dodge Ram 3500 Truck

1 Answer

What kind of diesel engine in a 1984 Ford Econoline Class C RV? Are these engines known for head gasket problems and should a rebuild have fixed that?

What you have is a Navistar 6.9L Diesel engine in your van-RV.
They are know to blow head gaskets----nomally its a matter of taking the heads off --clean everthing --check for unusual large crack in the glow plugs pre-cups, check heads for flatness and than slap the heads back with new head gaskets.
This engines if the normal maintenance was done regularily they will do a easy 300,000 miles--with the head gaskets replaced when needed.
the easiest way to check for this is look for bubbles in the coolant resorvoir bottle with the engine running.
Also the other most important thing is make sure that the cooling system is clean--means new coolant on schedule and radiator removed and have it rodded --cleaned out.
You can tell if it needs rodding by draining a little coolant -enough that you can see the tube ends thru the radiator cap neck --to see if they are plugged or open.

Nov 20, 2009 | 1984 Ford Econoline

2 Answers

Where can I download cummins NTA 350 engine repair manual?

Cummins dealers are happy to help thinking parts will be purchased through them. Give your local dealer a yell.


3 Answers

F-250 won't start

Check fuel pressure at the rack and at the pump unit.

Dec 15, 2008 | 2003 Ford F250 Super Duty Crew Cab

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