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Replaced timing components.....still didn't fix it.

Discussion in '1st Gen. Tacomas (1995-2004)' started by cab4you26, Sep 30, 2010.

  1. Sep 30, 2010 at 4:53 PM
    #1
    cab4you26

    cab4you26 [OP] Well-Known Member

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    So I spent two weeks every day after work trying to fix my truck for the obnoxious diesel-sounding tick it's been making (2.7l). We pulled the motor, took off the timing cover, etc etc. and found out the inner tensioner was messed up and there was slack in the chain. So I got a kit and replaced all the timing components (both chains, guides, tensioners) and replaced the rear main because it was leaking. Got it all back together and everything went pretty smooth. I was feeling pretty good about it. Anyway we start it up and what do you know, it starts ticking....just like before we fixed it. So at this point I am lost, confused, and pissed at all the time that has gone into fixing it. We put a stethescope on the valve cover and it appears the noise is coming mostly from the two cam gears. Took the valve cover off....no slack between the cam gears.....turned it over because the cams looked dry but they are getting oil. I'm lost. Everything looks like it should. Has anyone experienced this before or could my cam gears or cams be making this noise? Any help would be greatly appreciated.
     
  2. Sep 30, 2010 at 4:59 PM
    #2
    steve o 77

    steve o 77 braaap

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    miles on the motor?

    not sure what it could be but that info could be helpful.
     
  3. Sep 30, 2010 at 5:08 PM
    #3
    cab4you26

    cab4you26 [OP] Well-Known Member

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    Sorry, it's a 97 and it's got 100k. I think this ticking started when i over-revved it one day. I downshifted into a gear way to low and it went past redline. As for if it's the reason it's ticking I can't say for sure.
     
  4. Sep 30, 2010 at 6:08 PM
    #4
    steve o 77

    steve o 77 braaap

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    You may have floated a valve and it hit the piston. So you may have a bent valve.
     
  5. Sep 30, 2010 at 6:25 PM
    #5
    A10crewdog47th

    A10crewdog47th Member

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    yea i would check you valves. your cam gears shouldnt make that kind of noise if there not obvisoly broken are missing teath. check you valves and clearences and see if that isnt your problem.
     
  6. Sep 30, 2010 at 6:32 PM
    #6
    cab4you26

    cab4you26 [OP] Well-Known Member

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    I will talk to the guys tomorrow and see what they think. I'm a trainee so I'm still learning. The guys who helped would know better than i do, but would a bent valve mean I would need new pistons, etc as well? I have checked valve clearance. According to Alldata they are within spec.....
     
  7. Sep 30, 2010 at 8:10 PM
    #7
    MowTaco

    MowTaco Well-Known Member

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    Possibly... If you floated a valve like this kid

    [​IMG]

    Took mom's new M5 to go get gas... had a little too much fun.
     
  8. Sep 30, 2010 at 9:29 PM
    #8
    steve o 77

    steve o 77 braaap

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    If that happened it would not run at all, or at least miss very very bad lol.

    Good call getting it looked at again, let us know how it goes OP.
     
  9. Sep 30, 2010 at 9:53 PM
    #9
    joes06tacoma

    joes06tacoma Well-Known Member

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    Can't remember where I heard this, but I remember hearing something about these engines having an issue with wrist pin wear. One of our company trucks is an 04 with a 2.4 engine, it has a noise that sounds like what you are describing. It's been there for the last 30K that I can remember. Still runs fine, does not burn oil at 127K.
     
  10. Sep 30, 2010 at 9:55 PM
    #10
    joes06tacoma

    joes06tacoma Well-Known Member

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    I very seriously doubt you bent a valve if it's still running okay. It should show up on a compression test if you have a bad valve.
     
  11. Sep 30, 2010 at 10:04 PM
    #11
    4WD

    4WD cRaZy oLdmAn

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    By " Diesel sounding tick " Is it really that pronounced, like a Diesel sitting at idle, I mean is it a sharp tick sound that you'd hear if maybe a valve is loose ? When I think of a diesel type noise from anything but a diesel I'd associate that hollow sound as a possible rod knock or a wrist pin working its way loose but I'm talking worst case, yeah possibly floating a valve & if ya did then you probably gaulded the cam also, but how was it running ?? OK ?? Did you change any belts ??

    Think your mad now, think how'd it be to find out that the mysterious tick that appeared after you over revved was the result of the sudden change in RPM & you stretched & warped a fan/alternator/ac belt serpentine belt etc; & now you have the infamous "belt slap" which anyone who's had it can tell you it sounds just like a loose tappet or equally annoying noise coming out of your top end, of course this assumes other than the noise thats driving you batshit, that your truck runs reasonably well.....good luck tracking it down....:cool:
     
  12. Oct 1, 2010 at 8:14 AM
    #12
    cab4you26

    cab4you26 [OP] Well-Known Member

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    By "diesel sounding tick" i mean if you didn't know any better you would think it actually has a diesel motor in it. I probably should have stated this earlier because it might help. If you were to go out and start my truck when it's cool, this would be the motor at it's loudest. You start it up, the motor immediately runs up to 1.5 grand and you can't hear it, then settles at it's idle rpm and begins ticking. When you drive the truck and run it to it's operating temperature, the ticking settles and is hardly noticeable at all. I have ran it for about 13k like this.
     
  13. Oct 1, 2010 at 8:20 AM
    #13
    05RedTaco

    05RedTaco Nom Nom Nom

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    Pull the head and check valves.
     
  14. Oct 1, 2010 at 8:24 AM
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    steve o 77

    steve o 77 braaap

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    All I can think of now is the wrist pins or maybe even the crank bearings (the ones in the lower ends of the rods) but you would thing there would also be a whirling sound along with the diesel sound.
     
  15. Oct 1, 2010 at 9:02 AM
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    twfsa

    twfsa Well-Known Member

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    Like another poster mentioned the belts start disconnecting things and running it and see if you can isolate the problem.
     
  16. Oct 1, 2010 at 9:41 AM
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    dually

    dually Low and slow

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    I dont see how you can 'over-rev'.. there is a rev limiter in place on the factory ecu to prevent damage like valve float...

    Post a vid
     
  17. Oct 1, 2010 at 10:00 AM
    #17
    4WD

    4WD cRaZy oLdmAn

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    He wasn't accelerating, he blew a gear & over revved "de-cellerating, completely opposite ,very easy to damage this way, suck a valve, stretch a belt, etc;....
     
  18. Oct 1, 2010 at 12:56 PM
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    vantaco

    vantaco Well-Known Member

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    check/replace the lifters...but i'm thinking you floated a vavle(s) and bent it a bit


    do a leakdown test to see if it's the head
     
  19. Oct 1, 2010 at 12:58 PM
    #19
    rcbs204

    rcbs204 Well-Known Member Vendor

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  20. Oct 1, 2010 at 3:09 PM
    #20
    cab4you26

    cab4you26 [OP] Well-Known Member

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    it has good compression in all cylinders. crank and main bearings seemed to be fine when we pulled the pan but i didn't spend too much time on it. Might have to go over it again. I will try and get a video on monday and post it up here for ya.
     
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