3.1 valve adjustment - Team Camaro Tech
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post #1 of 9 (permalink) Old Oct 13th, 03, 02:08 AM Thread Starter
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Bruce
 
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do you adjust the valves on a 1990 v-6, 3.1 lit the same way you adjust other valves, by loosing them up, listening for the chatter and then thightening then back up, until the chatter stops?
Or is there another way?
Thanks
Bruce

69 Camaro, 496, 10.34 @ 134.77 mph.
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post #2 of 9 (permalink) Old Oct 13th, 03, 07:34 AM
 
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It is a hy- cammed, standard pushrod motor isn't ?? (I may be thinking of the 3.4 DOHC motor??). If it is just do it like any other.

I spin each p/r between my thumb and finger to feel for the lash being taken up while running and when it stops spinning, I go about a half turn or so more to pre-load each hy- lifter..

To me it's a feelie sorta thing here...

pdq67



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post #3 of 9 (permalink) Old Oct 13th, 03, 01:23 PM
a67
 
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In order to get the valve cover off the plenum and runners need to be removed. Because of this not many folks do the running lash adjustment.

GM states to back off the rocker until lash is felt then take up lash. Tighten 1-1/2 turns past that point. This needs to be done while the cam/lifter is on the base of the lobe.

Bob.
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post #4 of 9 (permalink) Old Oct 13th, 03, 05:14 PM
 
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Thx a67,

I'm not up on the newer, non-SB cars, so learned something..

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post #5 of 9 (permalink) Old Oct 14th, 03, 02:54 AM Thread Starter
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Bruce
 
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Thanks for the help.
I guess the next question is, my 3.1 needs a little TLC. Should I rebuild it or can it be replaced with another V-6. I know the 3.1 is different then other V-6's, but what can it be replaced with, other then the small block/ big block conversion. It's going to be my daughters car in a few years, so nothing wild.
Thanks
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post #6 of 9 (permalink) Old Oct 14th, 03, 06:28 AM
a67
 
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The hot tip is to go with the 3.4l engine. These can be found used in the early 4th gen f-body's ('93-'95).

Can also get the 3.4lHT crate engine from GM, about $1800. It is listed for trucks, but once bolted in can't tell that it isn't a 3.1l. Everything from the 3.1l gets moved over to the new engine (alt, intake, sensors, stuff like that).

With the crate 3.4l need to install some SVO (F*rd) 19 lb injectors in place of the current 3.1l injectors.

If an f-body 3.4l is used then use those injectors in the 3.1l manifold.


SBC swap: a lot of effort, but doable. Best is to get an entire donor car. Frame mounts, front brake line across K member, front springs, FI harness, engine compartment harness, A/C lines, alternator is on other side. Just lots of changes.
(oops, just noticed you said 'other then SBC/BBC', already typed so I'll leave it).

Bob.
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post #7 of 9 (permalink) Old Oct 14th, 03, 06:51 AM Thread Starter
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Bruce
 
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Bob,
Thanks for the info. So if i'm correct on what you are telling me, a 3.4 is basically a bolt in and all parts will bolt up ( alt, tranny, intake, and everything else found on the 3.1).
Correct?

Thanks
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post #8 of 9 (permalink) Old Oct 14th, 03, 10:38 AM
a67
 
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Quote:
Originally posted by bruce69camaro:
Bob,
Thanks for the info. So if i'm correct on what you are telling me, a 3.4 is basically a bolt in and all parts will bolt up ( alt, tranny, intake, and everything else found on the 3.1).
Correct?

Thanks
Bruce [img]graemlins/thumbsup.gif[/img]
Yes, a bolt in. The difference is like the difference between a 327 and 350 SBC. Only need slightly larger injectors as the 3.4l has greater displacement.

Just be sure that you get a rear wheel drive version (not a FWD version).

Here is a page that has info on the HT 3.4L:

http://www.gmgoodwrench.com/perfpart...e/12363230.pdf

Bob.
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post #9 of 9 (permalink) Old Oct 14th, 03, 08:15 PM
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if you use gm's 1 1/2 turn running preload the engine will run like crap!1/4 to 1/2 turn works great

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