been searching on here for a while on how to get top dead center to do my boost leak correctly. Any help would be greatly appreciated.

 

ttt

 

The crank pulley has a notch in the side of it that lines up with 0*TDC on the timing cover. To be sure you are not 180* out thought, take out one of the middle spark plugs and put a screwdriver in there and when it comes all the way up, right before going down again, you know you've got TDC.

 

You the man.

 

nifty little trick

 

i do the same but instead of a screwdriver i use a straw. just as insurance not to scratch anything but thats just me

 

I've always used the dipstick

 

you can put a positive stop in the cylinder and put a degree wheel on the crankshaft and something to use as an indicator.
spin the crank around where piston touches the stop, then take your reading on the degree wheel. spin the crank the opposite direction til the piston hits the stop. mark down the reading on the degree wheel for that side.

take the 2 readings you got and add them together.
divide the number by 2. move the indicator to the number you finally got. pull the stop out and rotate the crank until the degree wheel reaches zero. now you have ATDC but we have like 9* to play with where our actual piston sits at TDC so you should be able to get it with just a phillips screw driver and small rag wrapped around to protect piston

 

curious why you need top dead center to test for a boost leak?

why would you pull a middle plug to find TDC using the mark on the crank pulley? the mark on the pulley corresponds to the first cylinder being at TDC not the middle cylinders. correct? if not my cams are way out timing

 

If you want to be more accurate utilize a caliper gauge. Insert the vertical slide into the number one cylinders sparkplug boss and rotate the crank until you find your smallest reading. This way you know the piston has reached the highest position possible for that cylinder.

 

I use a compression tool fitting and put a balloon on there when the balloon is inflated the most then you know your at TDC

 

theres a marking notch on the crank pulley and theres timing markings on the lower timing cover.. align the notch in the pulley with the "T" on the cover and you will be top dead center.

 

that is right with the timing cover and crank pulley BUT it will not mean jack if you jumped time. I know from experience

 

i neverhave to line up TDC for a boost leak test i just throw it on there and pressurize

 

If you jump timing it will effect the entire rotating assembly unless just one of the pulleys jumped a tooth without effecting the other stuff..

the only pulley that can jump a tooth and not effect the rest of rotating assembly is the oil pump pulley (which is for a balance shaft timing)

Do you understand the notch is on the crank pulley and the crank pulley is bolted onto the crank sprocket?