Seized motor
Close
    
    
Page 1 of 3 123 LastLast
Results 1 to 10 of 25
Like Tree55Likes

Thread: Seized motor

  1. #1
    Senior Member Dell's Avatar
    Join Date
    Aug 2012
    Posts
    139

    Seized motor

    I did a rings and valve grind on my 89 TW. I honed the cylinder, assembled everything carefully with anti-seize compound or coated with oil, torqued to specs, put it in and filled with oil, bled the air out till it was pumping oil out, and as far as I know, all to the book. I started it and let it idle a bit on the stand, then took it for a gentle ride around the country block at about 40 miles an hour. I never made it home. At 12 miles it clattered and quit. I pulled the cylinder, and the piston is fried, as if it had no oil, but the oil is up. The little holes that let oil through from the inside of the piston to the cylinder wall were open, the oil filter seemed fine, and had collected some filings. I just can't wrap my head around it. TW brain pool, what do you think?
    Ken and jtomelliott49 like this.

  2. #2
    rbm
    rbm is offline
    Senior Member rbm's Avatar
    Join Date
    Jan 2011
    Posts
    4,304
    Does your oil filter have the 4 holes?
    Ken and jtomelliott49 like this.

  3. #3
    Senior Member Dell's Avatar
    Join Date
    Aug 2012
    Posts
    139
    Yes. It was in before. That was the first place I went, for all the bad stories I've heard over the years.
    Ken and jtomelliott49 like this.

  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    Super Moderator littletommy's Avatar
    Join Date
    Mar 2013
    Location
    Spokane, Washington
    Posts
    17,377
    Did you have any side covers off during the work? Is the oil still registering as full?
    Ken and jtomelliott49 like this.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

    Hidden Content <<<Click here. Hidden Content

  6. #5
    Senior Member Dell's Avatar
    Join Date
    Aug 2012
    Posts
    139
    Side covers off and new gaskets, new oil and still up with no leaks.
    littletommy, Ken and jtomelliott49 like this.

  7. #6
    Super Moderator littletommy's Avatar
    Join Date
    Mar 2013
    Location
    Spokane, Washington
    Posts
    17,377
    Quote Originally Posted by Dell View Post
    Side covers off and new gaskets, new oil and still up with no leaks.
    The reason I asked, and most members know this already, you lose some oil when you pull the cover off, then when the work is all done and everything is buttoned up again, folks tend to check and top off the oil and then start the bike and go for a ride. They fail to remember that the oil has to recirculate through the passages, tailshaft, etc to fill up again that which was lost. You can be several ounces low when you get back from your ride not knowing that the engine should have been started briefly, allowing the oil to reach those areas, and then re-checked before an actual ride. A 40 mile ride might not be good with only a half a quart in a bike that only holds 1.3 quarts in the first place...
    Ken, jtomelliott49 and oatmealx like this.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

    Hidden Content <<<Click here. Hidden Content

  8. #7
    Senior Member elime's Avatar
    Join Date
    Jul 2010
    Location
    San Jose, CA
    Posts
    6,981
    Is the connecting rod fried too?

    Oil is filtered going from the outside of the filter to the center. Once inside it goes two way -- out the 4 little holes to the top of the head and camshaft and out other way to the center of the crankshaft to the lower rod bearing. The upper rod bearing, piston, rings, etc. are all lubricated by splash which is oil being flung around everywhere. So check the oil passage way out the side opposite the 4 little holes -- out of the filter into the block. A blockage going to the crankshaft can cause the problem you say you have.

    oiol flow 2.jpg
    Long live the internal combustion engine!

  9. #8
    Mel
    Mel is offline
    Senior Member Mel's Avatar
    Join Date
    Jan 2013
    Location
    San Luis Obispo, Calif.
    Posts
    1,174
    This sounds more like a piston fitting too tight in the cylinder. All air cooled engines require more clearance between piston and cylinder. This is the exact symptom of that, not loss of lubricant.
    Mel
    littletommy, Ken, Peterb and 2 others like this.

  10. #9
    Senior Member SHAG's Avatar
    Join Date
    Oct 2013
    Location
    Bradford, Pa
    Posts
    969
    Quote Originally Posted by Dell View Post
    I did a rings and valve grind on my 89 TW. I honed the cylinder, assembled everything carefully with anti-seize compound or coated with oil, torqued to specs, put it in and filled with oil, bled the air out till it was pumping oil out, and as far as I know, all to the book. I started it and let it idle a bit on the stand, then took it for a gentle ride around the country block at about 40 miles an hour. I never made it home. At 12 miles it clattered and quit. I pulled the cylinder, and the piston is fried, as if it had no oil, but the oil is up. The little holes that let oil through from the inside of the piston to the cylinder wall were open, the oil filter seemed fine, and had collected some filings. I just can't wrap my head around it. TW brain pool, what do you think?
    Why did you take the engine apart to put in new rings and grind the valves?
    Ken and jtomelliott49 like this.
    Go like hell, You'll get there quicker!

    2005 BMWR12GS Rock Red 106k miles
    2013 TW200 - 8k- miles
    2018 X-MAX - 6k- miles

  11. #10
    Senior Member elime's Avatar
    Join Date
    Jul 2010
    Location
    San Jose, CA
    Posts
    6,981
    Quote Originally Posted by Mel View Post
    This sounds more like a piston fitting too tight in the cylinder. All air cooled engines require more clearance between piston and cylinder. This is the exact symptom of that, not loss of lubricant.
    Mel
    If the little end of the con rod is OK I will agree with you. If it is fried I am betting on lack of oil.

    Clearance for piston ranges from .001 min to .004 max according to the shop manual. Think they got it less than .001"?

    Piston.jpg

    Or maybe they used a Wiseco forged piston and the clearance should be at least .002" minimum.
    Long live the internal combustion engine!

Page 1 of 3 123 LastLast

Sponosred Links

Posting Permissions

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

Similar Threads

  1. Replies: 0
    Last Post: 05-09-2017, 10:23 AM
  2. Seized Screws - Suggestions?
    By BkCntryCrwlr in forum Technical Help
    Replies: 20
    Last Post: 03-09-2017, 10:30 PM
  3. Engine seized do to wrong oil filter.
    By Lostrider88 in forum Technical Help
    Replies: 135
    Last Post: 08-07-2016, 10:06 AM
  4. Whats a seized up TW worth
    By Draayer in forum General Discussion
    Replies: 25
    Last Post: 05-03-2016, 07:17 AM
  5. ttr225 motor in a tw?
    By stan in forum Technical Help
    Replies: 13
    Last Post: 11-28-2012, 06:28 PM