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Mirage Timing Issues

Discussion in 'Other Vehicle Discussions' started by TurboMirage, Oct 7, 2004.

  1. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    ok guys, i changed out my cam seal saturday. ive changed out tons of the cam and crank seals on little SOHC motors. in fact, 2 days before i did the seals waterpump and timing belt on an 89 tercel.

    welp i go to start the car,and it just cranks. i know i didnt move anything timing-wise. doesnt make sense. nothing is off, ive even tried moving the distributor and its set for the stock location.

    top it all off, i missed autocross. the girlfriend in the 240sx has been bringing me to work all week.

    this is where i left off sunday, after cleaning EVERYTHING.
    [​IMG]

    dmitri and i replaced the plugs, the spark sucked. we re-set the timing again. still just cranks. i have spark, i have air, and i have fuel.

    tuesday, bought a compression tester. tested it on the 240sx and it was great - but i have ZERO compression in any cylinder.

    thursday, i rotated the cam 180 degrees. heard clicking, so i put it back.

    sucks... any help would be appreciated. the head is an interrupt head. everything is the same as a D15b7 except i have an internal coil.
     
  2. Airjockie

    Airjockie Watanabe Whore!!!

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    bent valve's :(
     
  3. 94RedSiGal

    94RedSiGal Senior Member

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    That's what Matt told you two days ago. Sorry Chris. :(
     
  4. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    maybe i JUST purchased a 4g63t.......
     
  5. pissedoffsol

    pissedoffsol RETIRED

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    i told you to do that 123 months ago.

    but theres no such thing as a 4g63t

    its not a nissan. they don't denote turbo motor cars with a T at the end :0
     
  6. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    wtf are you talking about?

    the internals of the 4g63 and 4g63t are different.... one coudlnt run with a turbo bolted on, and the other couldnt run without the turbo.
     
  7. Celerity

    Celerity Well-Known Member

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    4G63Ts are real.

    Anyway, I just went through this with the 4Runner. Didn't want to run regardless of anything.

    Airjockie, Jeff, Jack, Myself... we all carefully examined timing and approved it. Went elsewhere for answers.

    Air and I even tried the cam in the neighboring 2 gear teeth, still.. no results.

    It was off a tooth. I had an aircraft engineer and friend of mine, my dad and I figure it out yesterday. It's still a mystery to me. We took the cover off and all 3 observed that the timing marks were dead on. Decided it was opening the exhaust valve too quickly, and slipped it back a tooth. When we did, and got everything back together, the timing marks STILL lined up, but the chain was visibly off one tooth. Together and now it runs.

    It's this really strange dynamic with SOHC motors. My dad and my friend understand it, I still don't.

    -> Steve
     
  8. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    steve, id give that a shot, but.... ive already got everything except for the head disconnected.
     
  9. IDMaxGuy

    IDMaxGuy Senior Member

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    would u be interested in purchasing a 4g63 i might have one for you i sell cheap... 6bolt even
     
  10. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    only if its the T son.
     
  11. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    where have you been? lol

    6 bent valves. :lol:


    oh sorry. time for an update. i cant believe im doing this shit by myself.

    got the head off, ordered new valve cover gasket, headgasket, 12 valve seals so far. going to port the head and get it tanked, new 3-angle valve grind. fuck i may as well pull the block apart and put new rings in.
     
  12. TurboMirage

    TurboMirage YEEAAAHHH VIP

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  13. Airjockie

    Airjockie Watanabe Whore!!!

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    Might as well.... ;)
     
  14. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    well, with all this shit i may as well forget the 4g63t. fuck it. ive got 1/2 the parts for 1.5T anyways... so much money into this little car... ugh.
     
  15. CRseX84

    CRseX84 Senior Member

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    wahts up with ur pistons? it looks like u ate some dirt or sumthin? :blink:
     
  16. hcivic.com

    hcivic.com Senior Member

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  17. TurboMirage

    TurboMirage YEEAAAHHH VIP

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  18. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    the head is going to the shop monday... along with whatever number of new valves they tell me i need.
     
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