Do I need Head Gaskets?
Thread Starter
|
Freshman User
Joined: Nov 2009
Posts: 25
Likes: 0
Do I need Head Gaskets?
I just completed a compression test on my 1996/7 F250HD 351 and my results are as follows:
1=145, 2=150, 3=145, 4=145, 5=120, 6=150, 7=150, 8=145
I have white smoke and steam coming from the tail pipes that’s why I did the compression test.
What is the diagnosis?
Before this problem I had a bad FPR and it was allowing <NOBR style="COLOR: darkgreen; FONT-SIZE: 100%; FONT-WEIGHT: normal" id=itxt_nobr_2_0>fuel
</NOBR> into the #8 cylinder and causing the motor to Hydro lock. <!-- / message --><!-- BEGIN TEMPLATE: ad_showthread_firstpost_sig --><!-- END TEMPLATE: ad_showthread_firstpost_sig -->
Thread Starter
|
Freshman User
Joined: Nov 2009
Posts: 25
Likes: 0
What will a cylinder leak down test tell me that a compression test does not? I have to buy a leak down tester thats why I am asking?
Logistics Pro
Joined: Sep 2009
Posts: 4,821
Likes: 53
From: Fulton County, Pa.
White smoke / steam is a sign of coolant in the cylinder. Does sound like a head gasket problem, but I'd wait for somebody else to answer your question instead of taking my word for it. It wouldn't be the first time I've been wrong. The white smoke / steam part I'm sure about. The head gasket, probably, but not a 100% guarantee. Thought a head gasket would cause two cylinders next to each other both to be low.
Thread Starter
|
Freshman User
Joined: Nov 2009
Posts: 25
Likes: 0
White smoke / steam is a sign of coolant in the cylinder. Does sound like a head gasket problem, but I'd wait for somebody else to answer your question instead of taking my word for it. It wouldn't be the first time I've been wrong. part I'm sure about. The head gasket, probably, but not a 100% guarantee. Thought a head gasket would cause two cylinders next to each other both to be low.
Logistics Pro
Joined: Sep 2009
Posts: 4,821
Likes: 53
From: Fulton County, Pa.
Not sure about that, I'd wait for somebody else to answer that one.
Posting Guru
Joined: Nov 2003
Posts: 1,006
Likes: 4
From: Sussex County, DE
A leakdown test will pump compressed air into the cylinders. This will tell you the leakdown rate of the cylinders. Also, the compressed air will make locating the point of leakage easier. You can look for and listen for compressed air leaking from the intake, exhaust, crankcase, and cooling system. That would help you identify a cylinder head leak, or determine that the coolant is getting into the cylinder by another means (I.E. a leaky intake or EGR cooler plate). If your engine is consuming coolant, but you don't get compressed air bubbles from the cooling system while doing this test, it is likely that something in the intake is your culprit, not the head gasket.
Trending Topics
Senior User
Joined: Nov 2002
Posts: 281
Likes: 0
From: Mathews Virginia
couple of things are you losing coolant also oil in your crankcase also look for white gunk around your dipstick
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Freshman User
Joined: Nov 2009
Posts: 25
Likes: 0
A leakdown test will pump compressed air into the cylinders. This will tell you the leakdown rate of the cylinders. Also, the compressed air will make locating the point of leakage easier. You can look for and listen for compressed air leaking from the intake, exhaust, crankcase, and cooling system. That would help you identify a cylinder head leak, or determine that the coolant is getting into the cylinder by another means (I.E. a leaky intake or EGR cooler plate). If your engine is consuming coolant, but you don't get compressed air bubbles from the cooling system while doing this test, it is likely that something in the intake is your culprit, not the head gasket.
Thread
Thread Starter
Forum
Replies
Last Post
tags1970
1983 - 2012 Ranger & B-Series
1
Mar 5, 2010 06:17 PM
qcy2k6
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
14
Dec 10, 2009 06:37 PM
Rooster368
Clutch, Transmission, Differential, Axle & Transfer Case
3
Dec 6, 2009 07:47 PM
AZ_Turbo
1994.5 - 1997 7.3L Power Stroke Diesel
6
Aug 28, 2009 11:52 PM
