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Author Topic:   motor ?
Racer13T
Dirt Full Roller

Total posts: 46
posted May 21, 2005 10:22 PM  
i have a 355 that i put a timing chain and gear in its all lined up o to o but when i goto adjust the valves by the book it seems the wrong lifters are up and you cant adjust what lifters the book says too. when i put the top timing chain gear 180 out they lifters are where they can be ajusted by the book. what could possibly be wrong i have tried everything. tried 2 diff cams in it thinkin maybe 1 was messed up but it does it with both cams. the crank lines up with the timing pointer when its on tdc. any help appreciated

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted May 21, 2005 10:26 PM  
what book is telling you how to adjust the lifters? Is it a hydraulic cam or solid cam... If it is a solid just for starters turn it over until both valves are good and closed. There are many ways to do it.

Racer13T
Dirt Full Roller

Total posts: 46
posted May 21, 2005 10:34 PM  
i have a chiltons and i know how to adjust lifters but dont understand why the circle on the timing gear on top has to be up before i can adjust them right. i tore the motor apart today and everything seems to be in good shape

[This message has been edited by Racer13T (edited May 21, 2005).]

Winland Racing
Dirt Maniac

Total posts: 122
posted May 21, 2005 10:45 PM  
but dont understand why the circle on the timing gear on top has to be up before i can adjust them right

Last time I remember installing my chain the dot on the top gear should be at 6 oclock and the dot on the bottom gear should be 12oclock. I think you are installing the cam 180 out... Unless I am misunderstanding..

Racer13T
Dirt Full Roller

Total posts: 46
posted May 21, 2005 10:50 PM  
thats how i had it and the lifters cant be adjsuted how right unless i move top gear to have the 0 at 12 o clock. i didnt think you could install cam 180 out because the top gear has the hole in it to line the cam up with it unless i am missing somthing

sideways
Dirt Forum Champ
Total posts: 715
posted May 22, 2005 10:04 AM  
The timing gears with the top gear and the bottom gear facing each other is #6 on comp. stroke.With both gears at 12:00 is where #1 is at compression.Why oh earth GM had this marvelous idea who knows?To check this put your fingers on #1 rockers roll it til the intake starts closing the dots should be getting close to 12:00.As long as you have a pin in the cam and used the proper slot on the crank gear(if it is 3 keyway type)and put them with the gears facing each other then this is #6 on the comp. stroke.If this is a 3 slot crank gear MAKE SURE TO READ THE INSTRUCTIONS.Hope this helps

waltonjr1
Dirt Forum Champ
Total posts: 516
posted May 22, 2005 10:25 AM  
The problem your having is b/c your not starting off on the compression stroke. Just b/c the dots are lined up dont meen #1 is at TDC. #6 could be at TDC and you are adjusting the valves that are supposed to be adjusted with #1 up. Im almost positive this is the problem your having.


waltonjr1
Dirt Forum Champ
Total posts: 516
posted May 22, 2005 10:28 AM  
SideWays beat me to it. Same theory


Eljojo
Dirt Forum Champ
Total posts: 968
posted May 22, 2005 10:47 AM  
fact aint theory
dats d way it iz

Racer13T
Dirt Full Roller

Total posts: 46
posted May 22, 2005 11:06 AM  
sideways that is exactly what is happening i thought i was losing my mind. everybody thought i was stupid when i told them about this. the block is a 68 or 69 is that how they did it back then?

sideways
Dirt Forum Champ
Total posts: 715
posted May 22, 2005 07:44 PM  
I have had all years from 60s to a 97 and that is the way they have allways done it.Go figure.You aren't losing it just being carful.Friend had a 3 slotted gear the line up dot was the size of a sharpe pencil tip,didnt see it and lined it up with th o and junked one head valves and piston and rod.But after running it all night it droped the head off the valve on the trailer unloading.lol He was sick.

[This message has been edited by sideways (edited May 22, 2005).]

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