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rattling starter

Discussion in 'XJ Technical Chat' started by stew, Oct 31, 2016.

  1. stew

    stew Member

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    Hi lads ever since stupidly putting synthetic oil in my 1982 xj750 i have had intermitent rattles when i start the bike but it has always started,but now it is happening all the time. i have done a couple of oil changes to try and help but now i dont know where to go with it can anyone help??
     
    stew, Oct 31, 2016
    #1
  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Start by performing a load test on your battery.
     
    k-moe, Oct 31, 2016
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  3. stew

    stew Member

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    Battery is all good ,is there any way of flushing the engine/cleaning all oil out completely without ripping engine apart?
     
    stew, Oct 31, 2016
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  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    there may be a drain on the transmission of the 750

    you can pull starter and use a cleaner to spray out the starter clutch
     
    Last edited: Oct 31, 2016
    XJ550H, Oct 31, 2016
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  5. stew

    stew Member

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    i can only find one drain plug if i removed the starter motor is there any products i can spray in that would clean any synthetic oil left on the starter clutch/engine?
     
    stew, Oct 31, 2016
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  6. Jetfixer

    Jetfixer Well-Known Member

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    sounds like starter clutch is slipping, I have similar problem, but mine is intermittent, I pulled starter found reduction gears had little grease( suspect P.O. might have replaced brushes) put grease ,replaced brushes ...now starts up with no sound of slippage( I hope it is fixed to replace starter clutch you have to split case:mad:)
     
    Jetfixer, Oct 31, 2016
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  7. stew

    stew Member

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    i def dont want to spilt the case,its weird how it only started to happen after putting synthetic oil in the engine.
     
    stew, Oct 31, 2016
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  8. Jetfixer

    Jetfixer Well-Known Member

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    Synthetic oil can "Wash" deposits sometimes a little to good . We used Exon 2380 for years on out DC-9's with JT8's we switched to Exon 2190 ....we were replacing oil filter due to clogging almost every flight plugged with carbon deposits....we switched oil a very short time to Exon 2297 all these are synthetic oils . You might pull the reduction gear off starter motor and re grease gears see if it helps seems to have helped mine.
     
    Jetfixer, Oct 31, 2016
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  9. stew

    stew Member

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    I'll give it a go,thanks for the advice pal : )
     
    stew, Oct 31, 2016
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  10. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Start by performing a load test on your battery.

    Have the starter brushes been replaced?

    Don't go looking for the middle gear drain...they can snap off.

    Run Seafoam in your oil and see if there is an improvement,

    Clean all grounds cables

    Start by performing a load test on your battery (there might be a hint here).

    If all that fails to improve things, then you will be splitting the cases (And replacing the alternator chain guide while you're in there).

    JASO MA compliant/ certified oil from now on.
     
    Last edited: Oct 31, 2016
    k-moe, Oct 31, 2016
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  11. Stumplifter

    Stumplifter Well-Known Member

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    because you did this?

    ^ do not skip this, sometimes it IS the simple things.
     
    Stumplifter, Oct 31, 2016
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  12. stew

    stew Member

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    Do i have to drain the engine oil before i do this?
     
    stew, Nov 1, 2016
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  13. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    No, but you'll want to drain it after; or at the very least leave the starter off for a few hours so the more volatile components of the carb cleaner can evaporate out.
     
    k-moe, Nov 1, 2016
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  14. stew

    stew Member

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    I have ordered some seafoam is it the same with that? This would be the third oil change.
     
    stew, Nov 2, 2016
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  15. stew

    stew Member

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    I have ordered some seafoam is it the same with that? This would be the third oil change.
     
    stew, Nov 2, 2016
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  16. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    You can run the oil with Seafoam until the next oil change. It will free up any remaining sludge, so you may want to change the oil again in a few hundred miles though.
     
    k-moe, Nov 2, 2016
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  17. stew

    stew Member

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    Do you think that there will be any of the synthetic oil still left in the engine after 2 oil changes?
     
    stew, Nov 2, 2016
    #17
  18. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Maybe residual amounts, but not enough that I think would still be causing a problem.

    How did you determine that the battery is not the issue?
     
    hogfiddles, Nov 2, 2016
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  19. stew

    stew Member

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    It's only a month old and I done a quick test with my volt meter and its holding its charge
     
    stew, Nov 2, 2016
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  20. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Put your voltmeter on it, and see what it says while you are trying to start it
     
    hogfiddles, Nov 2, 2016
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  21. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    ^ Load test.
    Even brand new batteries can have a bad cell, but have a good resting voltage.
     
    k-moe, Nov 2, 2016
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  22. stew

    stew Member

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    Noticed today the starter clutch only rattles when the engine is hot if i leave it for 20 mins and try again it starts up no problem any thoughts??
     
    stew, Nov 5, 2016
    #22
  23. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Could be:

    1. worn-out starter.... Time for rebuild or replacement (been there enough times)

    2. Starter clutch worn.... Hope not-- that's an engine tear-down
     
    hogfiddles, Nov 5, 2016
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  24. stew

    stew Member

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    You and me both bud,looked into how to strip it down it looks like a pure headache man.
    especially in my cold garage in November! : )
     
    stew, Nov 5, 2016
    #24
  25. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    It's not that bad, just time consuming.
    If it still slips after rebuilding the starter, then also plan on replacing the alternator chain guide as well. Those things fail from age more than from use.
     
    k-moe, Nov 5, 2016
    #25

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