This is topic Pushrod Help in forum Tech Talk at Northern California Ford Owners  .


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Posted by WeStBaY5.0 (Member # 5899) on :
 
I have purchased the Pushgrod lenghth checker for my 93gt. This is becasue i had no compression on cyl.1 and i was told it might be due to pusrob being to tall. I have gt40 heads that are ported and Crane 1.7 gold rockers and a custom cam( which i dont know details about...)My question is what should id do? should i change rockers and if so wich kind? or should i use custome Pushrods, and if thats so where could i buy these?
 
Posted by Quick 88LX (Member # 1950) on :
 
Buy a set of stock-length, hardened pushrods.
 
Posted by WeStBaY5.0 (Member # 5899) on :
 
will they clear?
 
Posted by Quick 88LX (Member # 1950) on :
 
Going with the stock sized pushrods will allow for correct valvetrain geometry and will reassure you that you do, in fact, have the correct length pushrods. If you haven't had the heads decked more than -4cc -- or something similar to that which would dramatically change the distance of the rockers from the lifters -- then they will clear fine.

Knowing the specs on your cam would help a lot with your decision but if you have already been running 1.7's, then you should be good to go.
 
Posted by Rob [5LVENOM] (Member # 2282) on :
 
I have some TFS hardened stock length 6.25 off the old GT-40 irons 1.7s setup cheap.
 
Posted by WeStBaY5.0 (Member # 5899) on :
 
how much do u want 4 them and wherte are u located
 
Posted by WeStBaY5.0 (Member # 5899) on :
 
TTT
 
Posted by Rob [5LVENOM] (Member # 2282) on :
 
Sac. Hows $40 bucks.
 
Posted by FasterDamnit (Member # 442) on :
 
If you just bolt stuff down without checking, you deserve the broken parts.


You need to find out WHY you have no compression on #1. How do you know it has no compression- test it?

Pull the valve cover and do a leak-down test- (if you don't see anything obvious like broken rocker, spring or bent pushrod). If you do see something obvious- don't just replace the bad part without being sure of the reason it failed. Might just break the new part.

Leak-down w/ compressed air can tell you alot. If you have excessive leak down on one cylinder, you can listen for the compressed air and figure out where it is escaping. Test w/ both valves closed.

Out the throttle body? Bad intake valve.

Out the exhaust pipe? Bad exhaust valve.

Out the oil fill on the valve cover? Probably bad headgasket.

Out an adjacent cylinder sparkplug hole? Head gasket again.


And to install aftermarket pedastel rockers CORRECTLY--->

http://www.californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=003591#000001
 
Posted by jaybquick (Member # 4286) on :
 
quote:
Originally posted by FasterDamnit:
If you just bolt stuff down without checking, you deserve the broken parts.


You need to find out WHY you have no compression on #1. How do you know it has no compression- test it?

Pull the valve cover and do a leak-down test- (if you don't see anything obvious like broken rocker, spring or bent pushrod). If you do see something obvious- don't just replace the bad part without being sure of the reason it failed. Might just break the new part.

Leak-down w/ compressed air can tell you alot. If you have excessive leak down on one cylinder, you can listen for the compressed air and figure out where it is escaping. Test w/ both valves closed.

Out the throttle body? Bad intake valve.

Out the exhaust pipe? Bad exhaust valve.

Out the oil fill on the valve cover? Probably bad headgasket.

Out an adjacent cylinder sparkplug hole? Head gasket again.


And to install aftermarket pedastel rockers CORRECTLY--->

http://www.californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=003591#000001
+1

Why doesn't anyone seem to ever want to actually investigate? Like dead cylinder = long pushrod. It doesn't work like that.

Also bubbling out of the radiator with the cap off will indicate a head gasket with the leakdown test. Broken rings will push air out the filler hole.

And if your valves are too tight due to no play in the valve train ford makes shims for the bolt down rockers. Also find out why only that cylinder? Is one pushrod longer? Were the valve seats ground too much causing the valve tip to sit higher? Are the valve seats worn? Etc.

Once again. DO A LEAKDOWN!

[ May 13, 2006, 12:54 AM: Message edited by: jaybquick ]
 




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