7.3 with a low compression on cylinder #5, is this common? - TheDieselGarage.com
Thread Details Posted by DM1, this thread has received 39 replies and been viewed 28874 times.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 40 (permalink) Old 11-28-2009, 10:56 PM Thread Starter
DM1
Junior Member
 
DM1's Avatar
 
Join Date: Nov 2009
Location: Southwest
Posts: 11
Points: 11,780
Thanks: 0
Thanked 1 Time in 1 Post
7.3 with a low compression on cylinder #5, is this common?

I'm new here and I just ran into a big problem with my 01 7.3 diesel. only has 77k miles and I'm the original owner so I know its been well maintained.

As I was townig the trailer down the Hwy, the motor started shaking and smoking. Towed it to the neares dealer and they're telling me I need a new motor cause #5 cylinder lost compression (about 60 psi).

Is this common and how expensive is it to fix. The dealer wants LOTS of money to fix it. Can it just be the an injector or a valve? It still starts and drives but engine doesnt idle well and has loss of power.

Thanks for your input.
Attached Thumbnails
Click image for larger version

Name:	My toys 004.jpg
Views:	133
Size:	685.3 KB
ID:	23443  

Last edited by DM1; 11-28-2009 at 10:58 PM.
DM1 is offline  
Sponsored Links
Advertisement
 
post #2 of 40 (permalink) Old 11-29-2009, 01:19 AM
Member
 
bpogue's Avatar
 
Join Date: Feb 2007
Location: Missouri
Posts: 391
Points: 43,646
Thanks: 124
Thanked 28 Times in 27 Posts
Garage
What tests has the dealer done to confirm the extent of the problem? They certainly should not tell you that you need a new engine without a fair amount of work. There are a number of things that could cause the problems you talked about.

1996 Int 4700, 175hp DT466, 5 speed, 2x rear end, service body

2001 F350 SRW flatbed, 4x4, crew cab

1978 International F2275 Dump Truck

1996 NH LX665, steel tracks on foam filled tires

2005 Tackeuchi TB145

2003 Takeuchi TL150

Case 850B Highlight, 4 way bucket
bpogue is offline  
post #3 of 40 (permalink) Old 11-29-2009, 01:32 AM Thread Starter
DM1
Junior Member
Threadstarter
 
DM1's Avatar
 
Join Date: Nov 2009
Location: Southwest
Posts: 11
Points: 11,780
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by bpogue View Post
What tests has the dealer done to confirm the extent of the problem? They certainly should not tell you that you need a new engine without a fair amount of work. There are a number of things that could cause the problems you talked about.
First they told me I need an injector then they did a compression check and said that I need a new motor. Its only $12900 parts and labor. They said I got dirt in the air intake and now I need new rings. Funny thing is I had them do a recall and a checkup 150 miles before and everything was perfect. Lol

14 Ram 3500 Diesel 4x4
DM1 is offline  
post #4 of 40 (permalink) Old 11-29-2009, 03:18 AM
Senior Member
 
pontiacross's Avatar
 
Join Date: Dec 2008
Location: Mexico, MO
Posts: 2,509
Points: 26,912
Thanks: 145
Thanked 82 Times in 79 Posts
Quote:
Originally Posted by DM1 View Post
First they told me I need an injector then they did a compression check and said that I need a new motor. Its only $12900 parts and labor. They said I got dirt in the air intake and now I need new rings. Funny thing is I had them do a recall and a checkup 150 miles before and everything was perfect. Lol
you could have some one build you a engine with buillit rods and abunch of other goodies for that, you'd still have to install it, but that is still pretty high.

if you have low compression it is either going by the valves or the rings. either way the engine has to be torn down.
It probably wouldn't be a bad idea to get a second opinion or at least a price of haveing the engine rebuilt and installed somewhere else.

Ross
Show-ME Smokers 2.6 modified street pulling truck "The Lone Stroke" My Videos
1996 f350, powerstroke, 4x4, 5-speed, 4.56 gears, Swamps 450/600 injectors, Swamps BFH turbo, Swamps Idm, Swamps tunes, BTS oil, SBC clutch, studs, springs, tubes, air to water intercooler, fuel system, factory rods!


Tow Rig
1997 f350, srw, reg cab, 4x4, 5 speed, 4.10 gears, 3in down pipe, straight pipe, mystery chip.

Becker Brothers Enterprises
pontiacross is offline  
post #5 of 40 (permalink) Old 11-29-2009, 03:55 PM
Super Moderator
 
John_G's Avatar
 
Join Date: Dec 2008
Location: Tyler, TX
Posts: 4,247
Points: 49,247
Thanks: 101
Thanked 406 Times in 347 Posts
If you got dirt in it, the COMPRESSOR BLADES would be ruined! I know, I've seen it enough times.

I will *guess* that the injector has failed allowing a massive compression leak, or you have a bad valve (bent, lifter bad etc).

GOOD low-miles used engines are 1/3 of that, INSTALLED!

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin

I vote for LIBERTY!
John_G is offline  
post #6 of 40 (permalink) Old 11-29-2009, 04:47 PM Thread Starter
DM1
Junior Member
Threadstarter
 
DM1's Avatar
 
Join Date: Nov 2009
Location: Southwest
Posts: 11
Points: 11,780
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by John_G View Post
If you got dirt in it, the COMPRESSOR BLADES would be ruined! I know, I've seen it enough times.

I will *guess* that the injector has failed allowing a massive compression leak, or you have a bad valve (bent, lifter bad etc).

GOOD low-miles used engines are 1/3 of that, INSTALLED!
I found a low mile engine and it will cost about 1/3 of what the dealer wants but would it be cheaper to take mine apart and fix it or just change the engine out. You can't always trust everything you buy at a wrecking yard. How do I know how many hours/ miles this engine really has. I know what and how I maintained mine.

14 Ram 3500 Diesel 4x4
DM1 is offline  
post #7 of 40 (permalink) Old 11-29-2009, 06:24 PM
Member
 
Join Date: Mar 2008
Location: Mason County
Posts: 281
Points: 21,179
Thanks: 10
Thanked 42 Times in 39 Posts
So has the dealer you took it to done any work on it yet? If not, I would check the compression on the #5 myself. If it's low, swap the #5 injector with another and see if the problem moves with the injector. If so, like John G. said, you got a bad injector causing some problems. Like John also said, check out the blades on your turbo and see what they look like because if you've pulled enough dirt to wreck a piston, the compressor blades will probably be wrecked too. It seems like if you pulled that much dirt it would have damaged all cylinders and you'd have low compression at all cylinders.

'94 F250xlt ext. cab. ZF5-speed 4x4. EBPV delete. DPP downpipe. Tymar intake. Tymar coolant filter. LF9691 primary filter. Electric fans. 10k mod. 1.0 turbo housing. Boost blanket. Over-axle exhaust eliminated. Electric fuel pressure gauge. BDP modded IDM. Heim joint clutch linkage. Adrenaline HPOP. LUK SMFW. DIY Elec. Fuel. FS1282, FF5230 fuel filters.
sdan27 is offline  
post #8 of 40 (permalink) Old 11-30-2009, 12:53 AM
rock removal technition
 
Join Date: Mar 2007
Location: greensburg
Posts: 589
Points: 24,193
Thanks: 10
Thanked 32 Times in 32 Posts
could be as simple as a bent pushrod, or as bad as a broke ring.
even a possibility of a bad injector cup. or even a loose injector

1996 psd 5speed 4x4 cc 8' bed, 3" body lift, 35's swamped, dp-tuner, intercooled, custom fuel system, no fan, and a few other goodies, 263k. 349.2hp sold
2003 7.3 4r100 4wd sc 8', xlt 20th anniversary edition
stock cept for duals. 260k sarted out as a 2wd xl work tk
Early 99 CC dually 4x4 4r100 dark lights, dark windows, stainless simulators
99 v-10 4x4 sc sb auto 275hp gas guzzler
double-s-diesel is offline  
post #9 of 40 (permalink) Old 11-30-2009, 12:19 PM
biz
Member
 
Join Date: Dec 2008
Posts: 204
Points: 22,002
Thanks: 0
Thanked 8 Times in 6 Posts
you werent using a drop in K&N air filter were you? they have been known to let dirt get by.....

but definately DONT LISTEN TO THE STEALERSHIP.......

they just want to replace the entire engine instead of fixing the problem.

if changing 1 injector fixes the problem.... your going to be saving a TON of money.

just their quote implies how willing they are to rape you.

2000 F-350 Super cab, Tadds tunes, AFE Pro Guard intake, 4" MBRP cool Duals, Nexus Gauges , Tubonetics Ball Bearing Turbo.

Last edited by biz; 11-30-2009 at 12:21 PM.
biz is offline  
post #10 of 40 (permalink) Old 11-30-2009, 01:12 PM Thread Starter
DM1
Junior Member
Threadstarter
 
DM1's Avatar
 
Join Date: Nov 2009
Location: Southwest
Posts: 11
Points: 11,780
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by biz View Post
you werent using a drop in K&N air filter were you? they have been known to let dirt get by.....

but definately DONT LISTEN TO THE STEALERSHIP.......

they just want to replace the entire engine instead of fixing the problem.

if changing 1 injector fixes the problem.... your going to be saving a TON of money.

just their quote implies how willing they are to rape you.
I agree about the dealer. That's why I'm getting a second opinion today. And yes I have a K and N drop in filter. Have used it for the last 50k miles so I hope this is not the true reason for the engine problem.

14 Ram 3500 Diesel 4x4
DM1 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Low compression???? SledMan 2003-2007 6.0L Power Stroke 2 09-07-2009 09:20 PM
Low compression in one cylinder? SledMan 2003-2007 6.0L Power Stroke 4 07-23-2009 12:54 AM
No compression on #1 cylinder? WHITEPOWERstrok 2003-2007 6.0L Power Stroke 19 02-28-2009 08:21 AM
06-24-4 6.0l - Service Remanufactured Engine, Cylinder Block, And Cylinder Head Ident Squatch Ford Oasis requests 0 03-22-2007 02:52 AM
No COMPRESSION in #4! Matty69 1994-2003 7.3L Power Stroke 3 04-21-2006 12:19 AM

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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome