Rod Brg Readings
+ Reply to Thread
Page 1 of 6 1 2 3 4 ... LastLast
Results 1 to 14 of 81

Thread:
Rod Brg Readings

  1. #1
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,464

    Default Rod Brg Readings

    Anyone care to read the "tea leaves" here ,The BBC Clevite rod brg inserts are from a jet boat motor with about 5 hrs on it , as seen they all have similar characteristics but some to a greater degree. The Crank is a new Scat unit and still looks perfect , rods were resized, its obvious that some "junk" has passed thru them from a diffferent issue (circumferal scores and partical embedment) but the "dotted" spotty patterns that are pervasive to some degree in all are curious. We know what we think , anyone else Thanks in advance Merry Christmas everyone Tom



  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    Dec 2007
    Location
    Olympia, Washington
    Posts
    588

    Default

    Was the oil milkshaked?? Looks like water got in the oil.

  4. #3
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,464

    Default

    Quote Originally Posted by Oldelmn8tr View Post
    Was the oil milkshaked?? Looks like water got in the oil.
    The residual oil in the pan was a little dark and smelled of fuel a "smidge" and it had some "cold block" condensation in the upper engine but no "milkshake" (that we know of ) Tom

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member EdonShano's Avatar
    Join Date
    Dec 2007
    Location
    Arroyo Grande
    Posts
    2,129

    Default

    Check measurements on that crank..I'd like to see pics of it also...what in the hell went thru that motor?? some of the bearings appear to be darkened? or is it just the pics...what was oil pressure on that motor. also...what are the clearances on the bearings to crank??
    Last edited by EdonShano; 12-24-2009 at 10:55 AM.

  7. #5
    Spiral out MikeF's Avatar
    Join Date
    Jan 2008
    Posts
    1,545

    Default

    The crank not cleaned before being assembled..........What do the main bearings look like?

  8. #6
    Senior Member alkyexpress's Avatar
    Join Date
    Nov 2008
    Location
    Orangevale CA
    Posts
    633

    Default

    Quote Originally Posted by jetboatperformance View Post
    The residual oil in the pan was a little dark and smelled of fuel a "smidge" and it had some "cold block" condensation in the upper engine but no "milkshake" (that we know of ) Tom
    My vote was going to be foreign liquid in the oil,,
    also the cold oil temp wont burn off the contaminate's..... ( just my opinion )...Eric

    ps : Have a Merry Christmas

  9. #7
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,464

    Default

    Quote Originally Posted by Unforgiven View Post
    Check measurements on that crank..I'd like to see pics of it also...what in the hell went thru that motor?? some of the bearings appear to be darkened? or is it just the pics...what was oil pressure on that motor. also...what are the clearances on the bearings to crank??
    The motor lost a cam (the "junk"), Cold OP was 70 psi , Crank looked perfect and rd clearance was .002 They may appear darkend due to the photo ? Tom

  10. #8
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,464

    Default

    Quote Originally Posted by MikeF View Post
    The crank not cleaned before being assembled..........What do the main bearings look like?
    Mike I would agree with you (re the emmbeded particals ) but the raised spots are perplexing , i'm leaning to the moisture too (Mains are similar btw)

  11. #9
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    How do the lifters look? Can I get a pic of a couple of those?
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  12. #10
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,470

    Default

    What weight oil were you running? When this engine was buiit, did it sit for a long time before it was run? This almost looks like the assembly lube dried up before it ran, or was crap to begin with, or just a dirty build to start with. I don't think what we see is water damage.
    Did you build this engine?
    Why the guessing game...what do you think? (my bet is you KNOW what it is)
    Last edited by scott foxwell; 12-24-2009 at 04:40 PM.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  13. #11
    Senior Member katchenup's Avatar
    Join Date
    Jan 2008
    Location
    vacaville ca.
    Posts
    387

    Default

    What kind of brake in oil did they use? And did they change it after brake in ? Hope they used the proper assembly lube, And not lube with graphite.
    What ever it is If you find out Tom let us know.

    Merry Christmas Tom, Rhonda, And josh.
    Steve and Janet

    All the grate minds took all the good answers.

  14. #12
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,840

    Default

    Tom. looks like a dirty assembly and high viscosity oil with a tight clearance tossed in for good measure. I'm sure you've seen an oil washed bearing before. Again the key here is dirty and tight. The tight is what is rolling the babbit of the bearing, the dirt is whats putting the racing grooves in the bearing.

  15. #13
    Senior Member GT Jets's Avatar
    Join Date
    Jun 2008
    Location
    Morgan Hill
    Posts
    2,234

    Default

    I'm going to throw my ..02c into the ring...

    It looks like you have an oil wash problem, caused by too much cold oil flow, sometimes by fuel diluted oil and have seen it on alcohol engines also..

    I would also concur on the debris, but that looks secondary to me...

    These look as though it was run hard or overreved on very cold oil with too much oil pressure...

    GT
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

  16. #14
    Senior Member miketeast's Avatar
    Join Date
    Dec 2007
    Location
    maryland
    Posts
    968

    Default

    Quote Originally Posted by jetboatperformance View Post
    Anyone care to read the "tea leaves" here ,The BBC Clevite rod brg inserts are from a jet boat motor with about 5 hrs on it , as seen they all have similar characteristics but some to a greater degree. The Crank is a new Scat unit and still looks perfect , rods were resized, its obvious that some "junk" has passed thru them from a diffferent issue (circumferal scores and partical embedment) but the "dotted" spotty patterns that are pervasive to some degree in all are curious. We know what we think , anyone else Thanks in advance Merry Christmas everyone Tom


    water flashing off...real hot oil and water.
    Team FTL
    Horsepower Homo
    Centistoke Fag

+ Reply to Thread
Page 1 of 6 1 2 3 4 ... LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

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

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Digg This Thread

Posting Permissions

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95