98 cutlass 3.1

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  #1  
Old 12-16-08, 03:21 PM
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98 cutlass 3.1

i have a 98 cutlass with a 3.1 i had to replace the intake manifold i had to take the pushrods out to replace the gaskets,i put them back in in the order they came out but it ended up bending 2 of the rods so i found out the intake and exhaust rods are diff in size.i need to know which valves are the intake so i can get the right rods in where they go. anyone know?.
 
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Old 12-16-08, 03:31 PM
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The intake pushrods are marked yellow (5 3/4 inch long) and the exhaust are green (6 inches long). Make sure the pushrods are properly seated in the valve lifters and rocker arms.
 
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Old 12-16-08, 03:35 PM
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They are? I did some head work on a 3.1 a while back and I don't recall that. Memory must be going. Mark's a lot younger, so he would remember.

But I think what he is asking is which holes are which in the engine.

I checked AutoZone's site for a diagram, but came up empty. Generally you can do it by eyeballing the alignment of the valves and the exhaust outlets in the head.

Also pray the pushrods took all the damage.
 
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Old 12-16-08, 03:47 PM
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98 cutlass

yes i know which rods are longer n such i just dont know which valve is which i didnt want to take intake back off i can access the rods from valve covers.
 
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Old 12-16-08, 03:50 PM
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In that case, I believe the intake pushrods are the outter, and the exhaust are the inner, (closest to head).

The rear head (2-4-6) will have push-rods in the following configuration:
short - long - short - long - long - short

The front head (1-3-5) will have push-rods in the following configuration:
short - long - long - short - long - short
 
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Old 12-16-08, 03:57 PM
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rods

hey thanks for the info i do see now that a couple are in wrong spot yes im pretty sure the rods are all that took the damage i havent ran it other than to hear the noise then shut it off. if i do these and it doesnt work i will be back but i appreciate your help alot.
 
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Old 12-16-08, 04:02 PM
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No problem. Stop by a autostore and pick up a Haynes/Chiltons manual. There should be a diagram in there for them.
 
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Old 12-16-08, 04:08 PM
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rods

yea i went to the auto stores and looked in the manuals they dont show hardly anything as far as which valve is which so i turned to the internet. but ty i will let ya know how it goes.
also when you gave me the short long ...... was that from facing the front of motor or from rear?
 

Last edited by denied1; 12-16-08 at 04:11 PM. Reason: addition
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Old 12-16-08, 04:13 PM
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It's almost always facing the motor from the front.

Also, clean up the area, they should be color coded to assist you.

After reading some more, the valve springs that sit higher are the intakes, short spring is exhaust. I'll stop now before I confuse myself anymore.
 

Last edited by HotxxxxxxxOKC; 12-16-08 at 04:31 PM.
  #10  
Old 12-16-08, 06:19 PM
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rods

well i got it fixed but your pattern of

The rear head (2-4-6) will have push-rods in the following configuration:
short - long - short - long - long - short

The front head (1-3-5) will have push-rods in the following configuration:
short - long - long - short - long - short

is actualy the opposite for each one it is long - short- short-long- short - long

but i got it fixed and your info helped me get it. thanks much.
 
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Old 12-25-08, 12:03 AM
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rods

well i got it all back together but now it doesnt run right its acting like its missing and i did a code scan which is giving me multiple misfire detected but not any certain cylinders. i checked everything again i even redid the intake and all complete do over still the same the car ran fine before doing any work other than the leak. any ideas here? i do smell rotten egg smell from exhaust very bad.
 
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Old 12-25-08, 06:58 AM
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Been there, done that, you bent an intake valve. Run a compression test and see which cyl
I (after screwing up one ) normally seperate the longs from the shorts.........You'll find that ALL FOUR corner valves are exhaust (long) so naturally the ones next to them will be intake (short) which leaves you the 2 cyls in the center of each head..
If you look at the gasket, you'll see a little "lump" that the push rod has to go through to get to the lifter..........You'll see the same "lump" in each corner..........These are exhaust valves and get long rods.........and the shorts go to the 2 spots remaining
Follow this guide after you find which valve is bent and remove that head
 
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