Results 1 to 12 of 12

Thread: Low or No Compression 89 D50

  1. #1

    Array
    Status
    Offline
    Join Date
    12-11-2012
    Posts
    29
    Location

    springtown, tx
    Vehicle

    1989 Dodge D-50
    Engine

    Please Select Your Engine Type

    Low or No Compression 89 D50

    Hello all,

    I posted this in one of my old Threads, but thought I'd start a new one with the correct title. Can someone please assist me with this.


    I finally got a compression tool and checked compression on the cylinders. Hopefully I did it right. I hooked it up and turn engine over and the readings I got are below.

    1st Cylinder: 60psi
    2nd Cylinder: maybe around 20
    3rd Cylinder: maybe around 20
    4th Cylinder: maybe less than 20

    After letting the key go, they pressure immediately went to zero.

    What does this mean?

  2. #2



    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,113
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    was this done hot or cold? how long did you crank it? also try pouring a tablespoon of oil in the cylinder before cranking. Can't say for sure without that info, maybe bent valves. Which motor is it?
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  3. #3

    Array
    Status
    Offline
    Join Date
    12-11-2012
    Posts
    29
    Location

    springtown, tx
    Vehicle

    1989 Dodge D-50
    Engine

    Please Select Your Engine Type
    It is the one with the D in the Vin #. Guessing the small 4 cylinder. I did not pour oil in cylinder and I did not do it when engine was hot. The engine was cold when I performed the test.

  4. #4

    Array
    Status
    Offline
    Join Date
    10-08-2012
    Posts
    369
    Location

    Cali
    Vehicle

    1988 Dodge Ram 50
    Engine

    G63B
    ok u gotta give us a lil bit more information.. look under the hood on passenger side of the firewall and there should be a plate which indicates info on the truck along w/ the engine type fitted to ur truck.
    if you can't dodge it, Ram it!

  5. #5

    Array
    Status
    Offline
    Join Date
    12-11-2012
    Posts
    29
    Location

    springtown, tx
    Vehicle

    1989 Dodge D-50
    Engine

    Please Select Your Engine Type
    It says: Engine: G63B

    Kinda hard to make out as it is old.

  6. #6

    Array
    Status
    Offline
    Join Date
    10-08-2012
    Posts
    369
    Location

    Cali
    Vehicle

    1988 Dodge Ram 50
    Engine

    G63B
    ok that means u got the carb'd 2.0L SOHC 4-cyl.

    what u wanna do next is do a leak down test, and like pennyman suggested pour a bit of oil in the cylinder before cranking it ovr to test compression. once u do that post the results here. oh btw, how did u perform the compression test initially?
    if you can't dodge it, Ram it!

  7. #7

    Array
    Status
    Offline
    Join Date
    10-08-2012
    Posts
    369
    Location

    Cali
    Vehicle

    1988 Dodge Ram 50
    Engine

    G63B
    Quote Originally Posted by blessedguy View Post
    Hello all,

    I posted this in one of my old Threads, but thought I'd start a new one with the correct title. Can someone please assist me with this.


    I finally got a compression tool and checked compression on the cylinders. Hopefully I did it right. I hooked it up and turn engine over and the readings I got are below.

    1st Cylinder: 60psi
    2nd Cylinder: maybe around 20
    3rd Cylinder: maybe around 20
    4th Cylinder: maybe less than 20

    After letting the key go, they pressure immediately went to zero.

    What does this mean?
    if u did ur compression test properly, based on that statement u made it could be leaky valves or a torn up head gasket or worst case scenario its a cracked head.
    if you can't dodge it, Ram it!

  8. #8

    Array
    Status
    Offline
    Join Date
    12-11-2012
    Posts
    29
    Location

    springtown, tx
    Vehicle

    1989 Dodge D-50
    Engine

    Please Select Your Engine Type
    just rented the tool, came home plugged it in each cylinder and turned engine over. engine was cold and I did not use any oil in the cylinders

  9. #9

    Array
    Status
    Offline
    Join Date
    12-04-2012
    Posts
    496
    Location

    New Bern, NC
    Vehicle

    1994 Mitsubishi Mighty Max
    Engine

    4G64
    With a leakdown test make sure you pay attention to where the leakage goes. The fact that it doesnt hold could be bent valves from a timing jump at some point. Usually rings will hold even when weak. I vote bad head gasket or warped head. If you hear it leak from the radiator cap it's that.

  10. #10

    Array
    Status
    Offline
    Join Date
    10-08-2012
    Posts
    369
    Location

    Cali
    Vehicle

    1988 Dodge Ram 50
    Engine

    G63B
    Quote Originally Posted by blessedguy View Post
    just rented the tool, came home plugged it in each cylinder and turned engine over. engine was cold and I did not use any oil in the cylinders
    I'd suggest u perform a correct compression test again just to be sure...follow the simple steps below, which is how I does it

    a proper compression test would require the following:
    1. engine would have to be at the normal operating temp.
    2. take all the spark plugs out
    3. take out the fuel pump fuse so it disables the fuel system
    4. block throttle wide open
    5. connect compression tester to #1 spark plug hole
    6. crank the engine over for at least 7-8 strokes
    7. repeat step 5 & 6 for the other cylinders

    now if u got low compression at first and gradually increases during the strokes that means ur rings are toast.. however, if u got low compression at first and it dont build up w/ each successive stroke as motor is turning over this indicates leaking valves, a blown head gasket or the head is toast. u can try a leak down test as I mentioned earlier for da heck of it to see if #s increase, but i doubt they will (if #s increase after u add a bit of oil, ur rings are def. gone) sooo based on the symptoms u described and the #s u came up w/ I'd say its either 1) leaky valve seals or bent/cracked valves, 2) head gasket, or worst 3) cracked/warped head...

    hope this helps.
    Last edited by ikeepzitclean; 01-24-2013 at 11:08 PM. Reason: spelling; revised
    if you can't dodge it, Ram it!

  11. #11



    Array
    Status
    Offline
    Join Date
    03-16-2011
    Posts
    3,614
    Location

    Sacramento, CA
    Vehicle

    1979 Dodge D-50
    Engine

    Chevy V6
    If you go to Pep Boys they will loan you the tool for free. Put down a deposit, get it back. In the end of the tool, that sticks in the spark plug hole. You should see something like a tire valve core. When cranking it should hold pressure in the tool so you will see the compression build up in the gage. Does it sound like the engine is just free spinning when cranking? You could also pull the valve cover and redo the test. This way you can check the valve train over. But it sounds like there is something bad going on inside.

    It should look something like this.

    Name:  comp tester.jpg
Views: 519
Size:  7.3 KB

    Not this. This is a CLT or compression leek tester.

    Click image for larger version. 

Name:	02-14-12_1153.jpg 
Views:	80 
Size:	44.7 KB 
ID:	4631
    Members come and members go, But the board keeps track of them.
    Check out the Fear Monger by
    clicking HERE.

    The MightyRam50 site is sponsored in part by On Site Concrete Inc.

  12. #12

    Array
    Status
    Offline
    Join Date
    12-03-2012
    Posts
    300
    Location

    Buckingham,VA
    Vehicle

    1992 Mitsubishi Mighty Max
    Engine

    4G67
    Hope you get the issue worked out

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •