Question about 1993 Chevrolet Lumina

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Automotive repair My car manual says to align the camshaft with the "flats" up. What exactly is a flat?

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  • gypsy001 Nov 02, 2008

    I just need to know what a "flat" is.

  • gypsy001 Nov 03, 2008

    that link has zero references to flats, how does that help me?



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As best I can tell, it is a flat area machined into the cams of a dual overhead cam GM V6 engine. These flat areas are used to align the (4) camshafts during timing belt installation. I found a link on the web which details timing procedures, with photos. There also appears to be special tools required for this procedure.

Posted on Nov 04, 2008


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On a 99 Amigo 3.2 if u have the cylinder heads off how do u make sure they areis in time with the engine also how do u get the engine in time

You probably need a manual with a picture. You need to find a mark on the crankshaft that aligns with a mark on the camshaft pulley. Usually you will put the mark on the crankshaft pulley at top dead center and then the camshaft pulley has to be in the exact spot so the timing belt will keep the relationship between camshaft and crankshaft. You can get free manuals at the library and maybe autozone has repair guides for your car. But bottom line...the timing is at theose marks on the crankshaft and camshaft and they have to be synchronized

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Setting Timing Without 3 So Called SPECIAL TOOLS Needed

1997-2000 Ford Contour 2.0L DOHC Camshaft Set up For timing Belt Replacement.most Instructions Call For 3 Different Special Tools No NeedFORD UPGRADED TIMING PULLEYS AND TENTIONERS In a UPGRADE KIT
Remove Valve Cover And TOP Timing Belt Cover CUT BELT OFF, Go to Rear of CAMSHAFTS (OppositeSPROCKETS) Look and you will see SLOTS at the end of Each CAM they are CUT ECCENTRICALLY . Use a Piece of Sturdy FLAT STOCK HARD STEAL (STRAIGHT) Turn CAMS one at a TIME Until they are EVEN With COVER GASKET SURFACE of Head, ALIGN BOTH Cams this Way Insert FLAT STOCK IN SLOTS So CAMS Don't Spring Back, And you Have VALVE TRAIN TIMED PERFECTLY, #1 Spark Plug OUT Bar Over to TDC WOODRUF KEY Should be Pointed Straight UP. This Is ALL there is to IT. Proceed with Timing Cover Removals and front Mount, REPLACE ALL PULLEYS AS A KIT (SOLD AS KIT) Install Timing Belt Set Tensioner According to KIT Instructions ans this will Illuminate All Special Tools SAID to be NEEDED for this Procedure, (( REMOVE FLAT STOCK AT CAMSHAFT ENDS AFTER BELT IS TIGHTENED.Install New Valve Cover Gasket #1 Spark Plug and Job is Done. Cuts 1 Hour 15 Minutes off Flat Rate

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Where can I find the full service manual for Bmw x1 2011? Brake pad, disc replacement, suspension, steering system alignment and balancing etc... Also how to repair the punctured run flat tyre on Bmw x1???

Take the flat tyre to a tyre shop and have it repaired there as believe or not , puncture repair requires the correct tools and procedure for safety. As for the rest a good workshop manual should have that information or get a service hand book from the dealer service centre.

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Bmw m42 engine. The sprockets on the camshafts must be refitted, which way do the arrows point

You must use a special tool which bolts onto the cylinder head. It is designed to hold the camshafts in the proper position. It goes over the flats on the camshafts to hold the camshafts in the correct position. This tool can be rented. Look on EBay or check with your local Snap On Tools, Mac Tools, or Matco Tools dealers to rent one. See the link below for photos of properly aligned timing marks for your engine.

1994 BMW M42 timing chain alignment marks Google Search

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Need directions on how to install a timing chain on a 2002 Saturn L series 2.2 liter along with the allignment marks for the intake and exhaust cams

To Install:
  1. Install or connect the following:
    • Timing chain drive sprocket to crankshaft
      1. Rotate the crank so the mark on the sprocket is at the 5 o'clock position
  2. Assemble chain to the intake camshaft sprocket alignment copper link to the "INT" diamond timing mark on the camshaft sprocket sat_car_22_tmng-chn_pos.gif

    NOTE: When lowering the timing chain rotate the assembly 90° to allow the chain to fall between the cylinder block bosses then rotate the assembly back so the camshaft sprocket is facing forward.

  3. Lower the assembly through the chain housing opening on top of the cylinder head. Use care to ensure that the chain goes around both sides of the cylinder block bosses NOTE: The crankshaft sprocket timing mark will be at approximately the 5 o'clock position.
  4. Route chain around crankshaft sprocket and align silver link to the timing mark sat_car_22_set_tdc.gif

    NOTE: The camshaft sprocket bolts are not reusable; they are torque-to-yield and must be discarded to prevent premature failure.
  5. Install or connect the following:
    • Intake camshaft sprocket loosely onto the intake camshaft then install the new camshaft sprocket bolt finger tight NOTE: It is not necessary to align the sprocket-to-camshaft offset notch at this time.
    • Adjustable timing chain guide through the opening on top of the cylinder head then install the chain guide bolt; torque to 89 lb-in. (10 Nm) sat_car_22_ajst_tmng-ch_guid.gif


    • Exhaust camshaft sprocket loosely onto the exhaust camshaft with the timing mark on the sprocket aligned with the silver link then install a new camshaft sprocket bolt finger tight
    NOTE: It is not necessary to align the sprocket-to-camshaft offset notch at this time.
    NOTE: The camshaft sprocket bolts are not reusable; they are torque-to-yield and must be discarded to prevent premature failure.
  6. Align the camshaft sprocket-to-camshaft then tighten the camshaft bolt using the following procedure: sat_car_22_crnk_tmng-c_mrk.gif

    NOTE: Do not rotate either camshaft more than 1/2 turn in either direction with the crankshaft at Top Dead Center (TDC). To do so may cause valve to piston contact resulting in a damaged valve and/or a damaged piston.
    • Ensure that the sprocket timing mark is at the 5 o'clock position
    • Rotate the intake camshaft using a 24mm wrench on the flats of the camshaft until the sprocket-to-camshaft alignment notch seats
    • When the sprocket seats on the camshaft tighten the sprocket bolt finger tight
    • Rotate exhaust camshaft using a 24mm wrench on the flats of the camshaft until the sprocket-to-camshaft alignment notch seats
    • When the sprocket seats on the camshaft tighten the sprocket bolt finger tight
  7. Verify that all colored links are aligned with the appropriate marks on the camshaft and crankshaft sprockets NOTE: If they are not repeat steps 1C through 4.
  8. Install the fixed timing chain guide and bolts; torque to 89 lb-in. (10 Nm)
  9. Install the fixed timing chain guide bolt access hole plug; torque to 30 lb-ft. (40 Nm)
  10. Install upper timing chain guide and bolts; torque to 89 lb-in. (10 Nm) NOTE: Use a 24mm wrench to support the camshaft while applying torque to the camshaft sprocket bolt. Do not torque the camshaft bolts against the timing chain as it may damage the timing chain.
  11. Torque the intake and exhaust camshaft sprocket bolts; torque as follows:
    • First Pass: 63 lb-ft. (85 Nm)
    • Second Pass: Turn an additional 30° using a torque angle gauge
  12. Install the sealing ring and tensioner assembly; torque to 55 lb-ft. (75 Nm)
  13. Install or connect the following:
    • Timing chain oil nozzle and bolt; torque to 89 lb-in. (10 Nm)
    • Camshaft cover assembly
    • Engine front cover
    • Negative battery cable; torque to 13 lb-ft. (17 Nm)

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Where are the timing marks on a 1998 ford contour lx zetec

If you are refering to the timing marks for timing chain alignment then you will need a special tool that fits in the end of the camshafts on the drivers side of the engine. You can make a tool to align the 2 camshafts out of some flat stock. The crankshaft mark will be on the crankshaft gear and engine. There are no marks on the camshaft gears.

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Where timing marks should be on the camshaft when the other marks are top dead center

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Your public library will have a manual covering your mechanical repair. Moreover, they have the automotive shops online software called AllData. It is the best auto technician database available today. You can print out specific troubleshooting procedures, diagrams, step-by-step istructions, and soforth. The typical person cannot afford to pay for this service, just automotive dealerships, etc... that is why the public library made it available to everyone and for free to view and print out material. This should Fixya! Good Luck!

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1 Answer

Flats on the camshaft

Flats on a camshaft usually refer to the flat sections the manufacturers provide that you can put the correct size open end spanner over to hold the cam in the correct position when setting up the cam timing. Often the valve spring pressure tries to rotate the cam into the wrong position for setting up the chain or belt, and that's why they have these flats. That's the only use of that terminology that I'm aware of, hope it helps.

Nov 03, 2008 | 1993 Chevrolet Lumina

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