No compression - Ford Truck Enthusiasts Forums



1999 to 2016 Super Duty 1999 to 2016 Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines

No compression

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 07-11-2016, 02:06 PM
Rick Wathen Rick Wathen is offline
New User
Thread Starter
 
Join Date: Jul 2016
Posts: 2
Rick Wathen is starting off with a positive reputation.
No compression

Hey fellas . I got a 2002 F250 5.4l with 219k KM on it . I've lost compression in cylinder 8 and losing it in cylinder 3. Just looking for some input on what it could be and if any of you have any tips on removing the heads with out taking the cab off or pulling the engine . Thanks !
Reply With Quote
  #2  
Old 07-11-2016, 04:19 PM
droldsmorland's Avatar
droldsmorland droldsmorland is offline
Posting Guru
 
Join Date: Nov 2011
Location: Land of Taxes
Posts: 1,540
droldsmorland has a good reputation on FTE.droldsmorland has a good reputation on FTE.
Do a wet a dry and a leak down test to pinpoint the problem.

A dry compression test is performed on the suspect cylinder. If the cylinder’s compression is found to be below specifications, oil is injected. Introducing oil to a cylinder with worn piston rings increases the cylinder's compression. The oil fills the gap between the ring and cylinder wall. If there's no increase after adding oil, an intake or exhaust valve is faulty.
Worn piston rings / cylinder walls: After running the first test, squirt 2 oz. of oil into the cylinder and rotate the crankshaft three more turns per cylinder. If the compression increases, the piston rings are at fault.

Burned valves: If results remain the same after injecting oil, one of the valves are bad or not seating correctly. Low compression in only one cylinder typically indicates a bad valve. Exhaust valves burn due to hot gases passing through. Intake valves have the advantage of being cooled by the incoming fuel.

Leak down test; this test pinpoints specific leakage.
Leak from crankcase indicates the piston rings are not sealing or a burnt piston.
Leak from the air intake indicates a bent or burnt intake valve.
Exhaust leaks from the exhaust manifold or muffler indicates a bent or burnt exhaust valve.
Leak from the radiator indicates a leaking gasket or cracked cylinder head or block.
If air is leaking from the companion cylinder it indicates a blown head gasket.

Even with methodical service as in regular oil changes since day one it may simply be a tired engine. You’re at or close to life expectancy of a gas engine.
Reply With Quote
  #3  
Old 07-11-2016, 04:32 PM
lwarrior1016 lwarrior1016 is online now
Senior User
 
Join Date: Jul 2015
Posts: 424
lwarrior1016 is starting off with a positive reputation.
^Great info right there. I have to ask though, how is 219,000 KM close to engine life expectancy?

My 99 f250 5.4L has 307,000 M on it and still runs like a champ.
Reply With Quote
  #4  
Old 07-12-2016, 09:21 AM
droldsmorland's Avatar
droldsmorland droldsmorland is offline
Posting Guru
 
Join Date: Nov 2011
Location: Land of Taxes
Posts: 1,540
droldsmorland has a good reputation on FTE.droldsmorland has a good reputation on FTE.
Ahhh didnt catch kilometers was thinking miles. 130K miles or 219 kilometers on a gas engine is nothing. There must be a mechanical problem or it was really neglected.

200K miles out of a gaser is ok with routine maintenance. At 200K miles your nearly 2/3 or more done(IMO). 300K miles you are in the minority with gas. Diesel not so. It takes methodical service to get a gas to go 300K miles and still be healthy. Most do not do methodical maintenance.
Reply With Quote
  #5  
Old 07-12-2016, 09:31 AM
lwarrior1016 lwarrior1016 is online now
Senior User
 
Join Date: Jul 2015
Posts: 424
lwarrior1016 is starting off with a positive reputation.
Quote:
Originally Posted by droldsmorland View Post
Ahhh didnt catch kilometers was thinking miles. 130K miles or 219 kilometers on a gas engine is nothing. There must be a mechanical problem or it was really neglected.

200K miles out of a gaser is ok with routine maintenance. At 200K miles your nearly 2/3 or more done(IMO). 300K miles you are in the minority with gas. Diesel not so. It takes methodical service to get a gas to go 300K miles and still be healthy. Most do not do methodical maintenance.

Understood, and I agree for the most part. I really like the design of the modular engines and I believe they can last a long time if they arent neglected. I did just do valve seals, timing components, and an alternator on mine.

I agree about OP's truck, has to be a mechanical failure.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Low compression=New engine? 6.whoa 6.0L Power Stroke Diesel 13 06-23-2017 10:29 PM
Compression test therigwelder 1994.5 - 1997 7.3L Power Stroke Diesel 14 12-30-2016 09:56 AM
2011 powerstroke Wfrost1982 1999 to 2016 Super Duty 1 12-29-2016 05:05 PM
No compression in #1 cylinder Ricardo Babirad 1994.5 - 1997 7.3L Power Stroke Diesel 7 03-09-2016 10:12 PM
Buying A Blown 460; What To Check?? AKHunter93 Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460) 1 11-21-2015 05:20 PM


Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 08:31 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.