DupermanDave

Is there ane asy way to tell if the engine is at TDC without removing things like spark plugs and the head?

I'm going to do my valve lashes in a few days and want to know how to confirm it's at TDC.

The reason I ask here is because I just want to be positive, as I'll have no help on this project and my confidence is really low at this point (even though I put the head on and engine back together by myself after a head gasket job, I'm still new to engines)

I know I can always remove spark plug number one and poke a screwdriver in there, but is there an easier way?

abecedarian

pull the valve cover... set crank to TDC... adjust all the valves that are loose...
rotate crank 1 turn to TDC again... adjust all the valves that are loose.
Done.
(hint- valves that were tight at one TDC will be loose at the next, and vice versa)

abecedarian

... or ...
pull valve cover, set to tdc. both valves on cyl 1 or both valves on cyl 4 will be loose so adjust whichever is loose... turn the crank 1/2 turn, adjust the next in firing order, turn 1/2, adjust next in firing order, turn 1/2, adjust next in firing order... done.

Windsor

*boggle*

Pulling the #1 plug is about the easiest thing you can do to determine TDC.

DupermanDave

Eh, didn't want to burn myself anymore, lol. I know its best to do valve lashing when the engine is warmed up. I've still got blisters from the last project i did.

Thanks guys. Much appreciated.

abecedarian

If you adjust them to a tight .007 intake and tight .011 exhaust you should be fine when warmed up.

Windsor

Put the little rubber "washer" back in your plug socket so that you don't need to get yer fingers that close to warm parts.

xzyragon

cant u just manually crank the flywheel til it lines up with the notch at number 5. It's what it said in the manual...

22REw/HP

There is a "key" for the crank gears, if that key is up meaning if you are looking straight at the motor and the key is @ 12:00 you are tdoc

DupermanDave

the "key" being the little notch or hole in the top of the crank pully? That's what we went by last time, I was unsure if this was TDC for cylinder one or TDC for another cylinder as well and you just had to keep rotating until this "key" and cylinder one matched.

874runnersr5

Its so easy, just put you finger in the #1 spark plug, Rotate the crankshaft till you feel the air come out of the #1 sparkplug and have the notch at 0.

DupermanDave

its hard being under the truck turning the crankshaft bolt and having your finger in the spark plug hole at the same time.

874runnersr5

get a helping hand then, its the easiest way to get tdc this way.

xzyragon

put a piece of celophane lightly in spark plug 1...

when it blows out and ur at 0, ur at TDC

Windsor

Little brothers are great! Let them burn the snot out of their fingers.

Matt16

Just look at the rocker arm and cam. When the cam is not pushing against the rocker arm, you're at TDC.

thook

I don't understand.....all the little tips? Crank mark at zero = TDC. Compression stroke = #1 and #4 valves will be loose. If not, you're on the exhaust stroke. Either way, if at zero, you're at TDC.

Like Abe said.....it's pretty simple.

DupermanDave

That's pretty much all i needed. I was just curious if there was any other way to see without removing the head or spark plugs, but I guess not.

thook

You never have to remove the head........unless you mean valve cover? Even then, like I said, if at zero.....

To verify compression or exhaust stroke, you can pull the dist. cap and check the rotor position. It should be at the #1 spark terminal on compression. 180* opposite that on the exhaust. This way you don't have to pull the valve cover, but it's moot because the cover has to come off anyway to adjust the valves.

You don't "have" to pull the plugs. But, it does make it easier to crank the motor over. I never do, though. I just strong arm the biotch...hehe. = breaker bar w/19mm socket from up top reaching down to the crank.

DupermanDave

Bleh. yeah, i meant valve cover. I mistyped "head". I don't know why.