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finding #1 TDC #1030850 06/28/11 01:58 AM
Joined: Jul 2005
Posts: 45
J
jbclem Offline OP
Getting the Wheeling Fever
This is for a 22R engine...the oil pan is off, the timing cover and timing chain are off. Although I think I have everything set at #1 TDC, I want to be sure I'm not at #3 instead. Could someone layout the most accurate way to be sure.

Especially starting with the numbering of the cylinders. I'm assuming that #1 if the front cylinder, but I haven't found the numbering sequence in any of my manuals. Is it 1-2-3-4 with the #4 the rear most cylinder? Or is there some other esoteric numbering scheme?

And can I tell anything by looking from underneath the crankshaft ...right now the first and third cylinders are up and the other two are down. Should there be an obvious difference between the first and third, ie,how far up each one is?

Let's assume that the crankshaft was turned a number of times without a timing chain, so you don't know where you're at. Where do you go from there?

From the Off-Road World
Re: finding #1 TDC [Re: jbclem] #1030851 06/28/11 02:43 PM
Joined: Aug 2003
Posts: 2,854
G
Greg_Canada Offline
Roll Me Over
It doesnt really matter.
It's not like it does anything different when it goes down and back up. #1 will always be #1.
What you have to worry about, is when your piston is at #1, that your cam / valves are in the correct position.


89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim
Re: finding #1 TDC [Re: Greg_Canada] #1030852 06/28/11 05:10 PM
Joined: Sep 2003
Posts: 1,686
Staceman Offline
Body Damage is Cool
And yes, #1 is the very front most cylinder. front to back, 1-2-3-4.


85 4Runner - With NEW Marlin 4.7 Gears!! It's a whole new beast!
Re: finding #1 TDC [Re: jbclem] #1030853 06/28/11 11:53 PM
Joined: Jul 2005
Posts: 45
J
jbclem Offline OP
Getting the Wheeling Fever
It's hard to check the TDC height of #1 because of the shallow angle of the spark plug hole. So I'm looking for another way to figure this out, so I can be sure the crank is set at #1 TDC. On the cam and valve side it's easier, I can check which rocker arms are loose.

Thanks Staceman, for the cylinder order. I know that's pretty obvious, but I just wanted to be sure.

Re: finding #1 TDC [Re: jbclem] #1030854 06/29/11 12:47 AM
Joined: Sep 2005
Posts: 970
R
RatLabGuy Offline
Rock Warrior
Quote
It's hard to check the TDC height of #1 because of the shallow angle of the spark plug hole. So I'm looking for another way to figure this out, so I can be sure the crank is set at #1 TDC. On the cam and valve side it's easier, I can check which rocker arms are loose.

Thanks Staceman, for the cylinder order. I know that's pretty obvious, but I just wanted to be sure.


You can take a screwdriver and stick it in the plug hole, and watch it go up and down and you rotate each way... when it reaches max height, you're at TDC <img src="/forums/images/graemlins/notooth.gif" alt="" />


With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.

Question Reality.
-----------------------------
'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah
Re: finding #1 TDC [Re: RatLabGuy] #1030855 06/29/11 03:44 AM
Joined: Nov 1999
Posts: 1,049
toyrunner Offline
Body Damage is Cool
When #1 is @ TDC, #1 valves will be loose. #4 will be tight.
Set the cam gear with the dowel pin straight up and the crank pulley timing mark @ 0*.


1985 SR5 4Runner
eLocked with Carter Lock
4.7:1 single case
Davez Offroad twin stick

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