Replaced crank shaft 99 blazer, how do I orientate the crank shaft to the cam? I have set the arrow on the cam gear down turned crank till number 1 piston is very near TDC in alinement with V on the crank gear will not start.....Help!!

you should have bought a Chilton or Haynes manual. most cars and trucks are all different and have a set way to set them. if you broke the chain or belt and bent a valve. you will need to do expensive repairs pulling the heads to change valves. not sure what car you have or why you pulled the timing off. so I cant be sure what to tell you.

line up the marks on crank shaft gear arrow to arrow, the front cam gear the mark goes to the middle on the rear cam gear the mark goes one notch below front gear mark they line up when the tension is put on belt.

Cam gear and crank gear have dots on them ,,,, put the gear dot to dot,, one pointing at the other,,,then remove number 1 plug ,,driverside front plug,,,,hold your finger over plug hole tight till the air blows out hole ,,, your close now to the conpression stroke,of number one plug, use a socket on crank shaft center bolt to move the crank,,,have some one turn it with hand to get the piston to up to the top of the hole,, right to the top,,, now get the distributor and get the rotor button pointed strait at the number 1 spark plug hole,,,your oil pump rod slit will need to align to ,,, look in distributor hole and use long screw driver or tire tool to turn the oil pump rod, needs to point at ,,line up with,,,,number one to,,, or real close,,,,,, make sure the disbributor goes all the way down and sits flush on block,,,,make sure vac advance is in 8 oclock position or close,,,,if you get it to go down but its not pointing just right move the plug wires to make number one plug where the rotor button is pointing on cap,,,,should be ggod to go,,,,

there are timing marks or notches on the head and a timing (dot) on the cam gear, and also on the crank gear and block.make shure these are all allined before tightning the belt tensioners.

1. crank on tdc / number one cylinder all the way up /balancer mark will be on 0 degree's
2. turn cam shaft till nuber one cylinder will be closed (both vavles will be closed on number 1 cylinder)
3. dist. rotor will point to number 1 terminal (plug wire) on dist. cap
4. this will be in cam timing
5. will have to set advance /****** timing after running w/timing lite
6. after set timing belt can crank before putting all assc. back on (just run enough to see it will crank)

Depending on make and size of engine u need to get the #1 piston at tdc top dead center u do this by taking the spark plug out of the #1 cylinder put yure finger in sparkplug hole and turn cranshaft till u feal yure finger being pushed out by compression now take a straw and put it in the spark plug hole u will need a breaker bar on larger engines to turn the crank with the bolt on the pully small 4 cyl u can turn it by hand once u feal the straw being pushed out of the whole turn the crankshaft back and forth to get the straw exactly where its all the way up just before it goes back down yure at tdc now on the gears there is a dot or a mark on the front side line them up using a straight edge line them up so both marks are on the inside facing one another pull both gears out leave the bigger of the two on the shaft place the belt on the smaller of of the cam shaft now u want to put the belt on the bottom side of larger gear and try and get the teeth so the top and bottom gear marks line up again when u push cam gear on splean of cam shaft if they apear to b lined up a little at a time push crankshaft gear n a bit then cam shaft gear switching between the two till they are all the way seated and there u go

Answer

If this is a single overhead cam, possibly A15SMS (engine type):

If you have everything stripped down and can see the crank shaft gear, you will notice an arrow stamped into one of the gear teeth.
this arrow must point towards the bottom, you will notice a mark (notch) cut into the housing, line the arrow on the gear with this notch.

remove the four 10mm bolts that secure the top cover of the timing belt, gently open the cover (not removing it) to see the Cam Gear. You will not be able to remove the cover because of the design.

The Cam Gear should have a line stamped into one of its teeth, this should be pointing up and towards the top. On the inner cover you will notice a notch in the casing, line both up together if it is not already.

You can check the following if unsure:
Remove # 1 spark plug (nearest the Cam Belt) and place a long screwdriver in the hole carefully to feel the piston is at the top, #2 and 3 will be down and the last one #4 at the distributor end will also be up.

Remove the rocker cover and you should see the Cam loabes on #1 piston free, (no pressure on the cam shaft) meaning the valves are closed.


tim

crank gear dot up - cam dot down. crank dot up number 1 is top dead center ..cam gear down the vavle on number 1 is closed . dist timing is set to number 1 plug wire (rotor pionting to num. 1 terminal on cap)

Hello Friend:

Yes i can tell you how to set your Timing Marks.

Your Top Gear the Cam Shaft Sprocket you want the timing Mark you'll want it to be Pointing Down .it won't be completly straight Down but Very close to it.

You'll want your Lower Sprocket (Crank Shaft) Point Upward .Until both Cam And Crank Shaft Marks Ar Directly in Line with the Other.

As Long s you Have those 2-Marks Meeting Straight Across from each Other,You will be Set t Top Dead Center.

Meaning the your number 1- Piston Should be up and on the Compression Stroke, Not on the Power Stroke but Compression.

Either Way Sir if you got em Lined up like I was talking About you'll be Fine.

This will get your Timing Gears Lined up Properly,.

Thank You Sir for Using Fixya Please let me know the Quality of my Solution by Voting for me.

Thanks Again From d_hubbs

Remove tappet cover and turn engine till the lobes on the cam shaft at no.1 cylinder are facing upwards and not pushing on the lifters.The cam gear has a little line on the side of it near one of the teeth that should line up with the top edge of the cylinder head.Get no.1 piston at TDC (top dead center) and check that the crank gear mark lines up with the marks on the plastic cam belt cover.Fit belt turn engine and check marks again.