B18a1 tdc
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Thread: B18a1 tdc

  1. #1
    Member joe_kewl81's Avatar
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    B18a1 tdc

    So I have a 91 Integra....Im pretty sure the timing belt has never been replaced...no big deal i have every intention of replacing it. Anyway the timing belt is loose, which seems to be my obvious problem. I do have spark and i am getting fuel. The car tries damn hard to start but wont. I have taken off the the timing belt and reset the valve timing because it had slipped and the car stopped running. I disconnected the battery to reset the computer and pulled the spark plug to check out the piston to attempt top dead center. It ran great for a couple days, better than when i got it. The timing belt was flapping around making terrible noise, but it was running. Then only a block from home after a test drive, it began missing and dying. I pushed it back home and tried again to reset the timing. Now it wont start at all. Ive tried again to reset the valve timing, but my main problem is top dead center. I'm assuming i need to removed the crank pulley, remove the timing cover, and look for a mark. What is my indicator on the engine and what is my indicator on the crank shaft? Also my old sentra was supposed to be set to 5 degrees before TDC. so is this honda the same? Or is it supposed to be at zero or perhaps 5 after? Maybe even 10 either direction. I have done this before, just not with this car. I suppose I'll just buy a chilton's lol.

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    Vivere est Cogitare TheOtherDave™'s Avatar
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    Off the top of my head, the B18A1 should be timed at 10° BTDC, but check that against the Chilton manual.
    What worries me most is the sound coming from your timing belt.

    With all due respect, stop messing around and replace the timing belt, the tensioner and the water pump ASAP.
    If the belt fails, valves and pistons will collide with wallet-flattening consequences.
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    Quote Originally Posted by TheOtherDave™ View Post
    Off the top of my head, the B18A1 should be timed at 10° BTDC, but check that against the Chilton manual.
    What worries me most is the sound coming from your timing belt.

    With all due respect, stop messing around and replace the timing belt, the tensioner and the water pump ASAP.
    If the belt fails, valves and pistons will collide with wallet-flattening consequences.
    By the way, what is the life of a timing belt for a '91 Integra? I have only 68,000 miles on mine.

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    Vivere est Cogitare TheOtherDave™'s Avatar
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    Quote Originally Posted by martinjsxx View Post
    By the way, what is the life of a timing belt for a '91 Integra? I have only 68,000 miles on mine.
    90K miles is the typical replacement interval, but since it degrades with heat, there's a time component as well.

    Obviously, replacing the belt is much cheaper than repairing the top end after it snaps. I would replace the belt now unless you have proof it was done in the last five years.

    It's the noises you describe that makes me think your timing belt tensioner is on its last legs. You might get luck and only jump a tooth or two when it fails, but I would not take that risk.
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    Quote Originally Posted by TheOtherDave™ View Post
    90K miles is the typical replacement interval, but since it degrades with heat, there's a time component as well.

    Obviously, replacing the belt is much cheaper than repairing the top end after it snaps. I would replace the belt now unless you have proof it was done in the last five years.

    It's the noises you describe that makes me think your timing belt tensioner is on its last legs. You might get luck and only jump a tooth or two when it fails, but I would not take that risk.
    Thanks for the reply but I was not the original poster, just jumping in when I saw the topic. Do you have an idea what a reasonable price would be to have the belt replaced by an independent mechanic?

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    Vivere est Cogitare TheOtherDave™'s Avatar
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    Quote Originally Posted by martinjsxx View Post
    Thanks for the reply but I was not the original poster, just jumping in when I saw the topic. Do you have an idea what a reasonable price would be to have the belt replaced by an independent mechanic?
    So much for my reading comprehension.
    In my defense, I didn't see the OP's avatar and shot from the hip.

    $400-ish maybe? I've done mine myself, so consider that a wild ass guess.
    Last edited by TheOtherDave™; 06-29-09 at 05:07 PM.
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    Quote Originally Posted by TheOtherDave™ View Post
    So much for my reading comprehension.
    In my defense, I didn't see the OP's avatar and shot from the hip.

    $400-ish maybe? I've done mine myself, so consider that a wild ass guess.
    Thanks for the estimate. Given the labor intensive effort in replacing the timing belt, are there other things that should be replaced at the same time like the water pump? I think I heard that somewhere, but could be wrong.

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    Vivere est Cogitare TheOtherDave™'s Avatar
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    Quote Originally Posted by martinjsxx View Post
    Thanks for the estimate. Given the labor intensive effort in replacing the timing belt, are there other things that should be replaced at the same time like the water pump? I think I heard that somewhere, but could be wrong.
    Yes. The water pump is driven by the timing belt and should be replaced out of an abundance of caution.
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    I don't know how much of this is true to the B18a1 but the B18b1 has two 5 mm holes in the cam and the cap that retains the cam (the one right next to the cam gear). With that you have your cams set to top dead center. As for the crank, there are 4 marks on the crank pully. Three right next to each other and one thats by its self. Line that up with the little tab on the timing cover or the arrow on the oil pump and you should have it set. The books says to then rotate the crank 4 to 6 times until you reach TDC again. Turn the cam gears 3 teeth counter clock wise (The way honda engines rotate). Then tighten the tensioner to 40 ft lbs.

    Like I said, this is for the B18b1, I don't know the changes from the a1 to the b1.

    And as TheOtherDave said, I would replace the belt and water pump.
    1996 Integra Special Edition 5 speed *SOLD*
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    Member joe_kewl81's Avatar
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    got the timing belt changed. Wasnt too hard once i had the right tools. I managed to find the timing mark on the crankshaft, and even after extremely close inspection found the marks on the pulley. However the car still wont start. Unfortunately i disconnected the battery after my check engine light was on so the computer codes werent saved. My timing is good, i know im getting fuel, and ive tested all the wires for spark. Now im thinking it must be a sensor. Obviously i dont want to spend money replacing sensors if i dont know which one it is. I dont even know where to start. Im beginning to think i might just swap the engine because i have another that runs. But its currently on a manual trans, (this car is auto) Trust me id love to swap it because i wanted a manual anyway, but ive noticed a couple extra vacuum switches on this car that the manual didnt have...

  11. #11
    Member joe_kewl81's Avatar
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    Quote Originally Posted by TheOtherDave™ View Post
    Yes. The water pump is driven by the timing belt and should be replaced out of an abundance of caution.
    ironically enough the water pump went out on the replacement engine i ended up going with, glad i had the other engine for "practice" first, and im also glad i now know how to replace that damn thing, as well as find the tdc marks, thanks for the help.

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    can some one help me im trying to find TDC with out timing covers i do have a dial gauge and my issue is there like a thousanth of an inch space between the rise and fall of the piston where exactly should i set it at ? as it rises and pauses or halfway through the pause or at the end right before it starts to fall and is there a better way to lock the cams together cuz the hole punches alldata recomends dont work cuz the holes on the cams are bigger than the holes on the cam holders lol

  13. #13
    Senior Member ChrisS's Avatar
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    TDC for the cams is simple.
    On cam pulleys, "UP" arrows pointing up and witness marks (- bolt - - bolt -) line up parallel to head surface.

    Engine TDC
    As long as you're very close to the top of the stroke, the timing belt should index correctly to TDC.
    how many teeth on the crankshaft timing belt pulley(n)?
    360/n = how much you would have to be off to miss being correctly synced between the cam shafts and crankshaft.

    Where are the timing covers?
    Note: without the engine timing belt cover, I don't know how you will set the engine timing.
    (I don't know which direction the crankshaft keyway should be pointed when at TDC. It could be straight up toward the top of the engine block which would make the most logical sense.)

    take care,
    ChrisS
    Last edited by ChrisS; 02-08-17 at 09:32 PM.

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