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Timing marks

S

Skip Burney

Member
I was just looking at the timing marks after I put the pistons in today and when the cam and crank marks match up all 4 pistons are equally down in their cylinders. Is this correct? It's like 2 are half way up and 2 are halfway down. I was thinking like other engines that when the timing marks match up that # 1 should be at TDC .
 
(quoted from post at 19:34:36 05/14/17) I was just looking at the timing marks after I put the pistons in today and when the cam and crank marks match up all 4 pistons are equally down in their cylinders. Is this correct? It's like 2 are half way up and 2 are halfway down. I was thinking like other engines that when the timing marks match up that # 1 should be at TDC .
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t is correct & you thinking is wrong. Sorry, but just the facts.
 
I'll just finish building it with #1 at TDC. That makes setting the dist up easier. Since it is still on the engine stand with no oil pan on or flywheel to look at I was just checking
 
Skip,Yes most engines the cam is set at TDC,on the N engine the cam is timed at 90,deg. BTDC one of Henry's deals.
 
(quoted from post at 05:34:36 05/15/17) I was just looking at the timing marks after I put the pistons in today and when the cam and crank marks match up all 4 pistons are equally down in their cylinders. Is this correct? It's like 2 are half way up and 2 are halfway down. I was thinking like other engines that when the timing marks match up that # 1 should be at TDC .
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Hello Skip its time to learn sum'N, sum"N that will bail you out in most of you adventures. Its bailed me out a many time especially on this new modern day chit that does not use key ways to nail the cam gears to the crank... A N is as good a engine to learn this on I know of because you can see the valve movement in relation ship to the pistons :wink:

http://forums.yesterdaystractors.com/viewtopic.php?t=1185666&highlight=rock
 
(quoted from post at 20:43:24 05/14/17) Skip,Yes most engines the cam is set at TDC,on the N engine the cam is timed at 90,deg. BTDC one of Henry's deals.
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ot true. Check a few GM v8s
 
It isn't. a V6 or a straight 6 either and all of those GM engines timed with #1 at TDC and the timing marks aligned even the 348 and 409's timed that way
 

Don't matter... Most newer engines don't use timing marks you lock/indicate the crank and cam in then install the timing chain/gears... The cam gears are not keyed they spin on the shaft till you nail them down...

Either way learn on the rock to confirm valve timing...

Next up versions of VVT that uses a hydraulic actuated cam gear are hydraulic actuated cam lobs... Learn "On The Rock" at the least you can confirm base timing is correct.
 
(quoted from post at 13:18:38 05/15/17) It isn't. a V6 or a straight 6 either and all of those GM engines timed with #1 at TDC and the timing marks aligned even the 348 and 409's timed that way
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ell, I guess you could argue that you are correct, since you did say only TDC, not TDC-compression stroke. On those V8s, when gear marks align, #1 is at TDC-end of exhaust stroke. Cam gear mark at 6 o'clock and crank gear mark at 12 o'clock. #6 will be at TDC-compression.
 
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