Adjusting Rockers While Engine is off?
Re: Adjusting Rockers While Engine is off?
So should the "U" be upside down or right side up?
Re: Adjusting Rockers While Engine is off?
Also, what do I torque the studs to? I've heard all different numbers from 30-45.
Re: Adjusting Rockers While Engine is off?
The stamped "U" always faces out so you can see it. I don't torque over 30# these days for head studs. Factory manuals don't always agree and there have been revisions so it's best not to use those numbers. Make sure the stud does not spin further into the block or you could have a clearance issue between the end of the stud and the connecting rod. That is not likely with old studs but it's good to pay attention.
Dave W. from Gilbert, AZ
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
Re: Adjusting Rockers While Engine is off?
The "U" should be visible. I can't remember if it's facing up or down but you cannot install it the wrong way in that regard. The pushrod holes have to be at the bottom.
As for torque: 30 ft-lbs! GM ran the torque recommendations up in later models but then backed down again. These days the cases aren't as strong as they used to be so we're saying "Test (during engine build) to 35# but torque to 30# for actual use. 30# has been the recommended torque for over 30 years now.
As for torque: 30 ft-lbs! GM ran the torque recommendations up in later models but then backed down again. These days the cases aren't as strong as they used to be so we're saying "Test (during engine build) to 35# but torque to 30# for actual use. 30# has been the recommended torque for over 30 years now.
'61 140 PG Rampside
'66 Rear Alum V8 4-dr
'60 Monza PG coupe (sold, sniff, sniff)
'66 Corsa Fitch Sprint Conv. (First car 1971, recently repurchased)
'66 Rear Alum V8 4-dr
'60 Monza PG coupe (sold, sniff, sniff)
'66 Corsa Fitch Sprint Conv. (First car 1971, recently repurchased)
Re: Adjusting Rockers While Engine is off?
I know the stamped "U" is facing me but it is upside down. Is that right?
Re: Adjusting Rockers While Engine is off?
It doesn't matter what orientation the "U" was stamped by the factory. Once the "U" side is facing you the part can only be installed one way. Don't over-think it.jmikulec wrote:I know the stamped "U" is facing me but it is upside down. Is that right?
Dave W. from Gilbert, AZ
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
Re: Adjusting Rockers While Engine is off?
Ok, so what could that bad sound be because I have those plates on right? Back to square one.
Re: Adjusting Rockers While Engine is off?
Corvair lifters are famous for clattering. After an adjustment they might make noise for a few miles. Even after a long period of sitting they will clatter until the engine is running for awhile.jmikulec wrote:Ok, so what could that bad sound be because I have those plates on right? Back to square one.
If it sounds like a bunch of them are clattering and not getting better then maybe they are not set correctly? As a basic starting point, can you see about three threads showing though the top of the rocker arm nuts after you complete the adjustment?
Dave W. from Gilbert, AZ
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
Re: Adjusting Rockers While Engine is off?
So it's the rockers making the noise. It sounds like a high pitch mixed and a low pitch knock at the same time.
Re: Adjusting Rockers While Engine is off?
And the lifters should make what type of sound?
Re: Adjusting Rockers While Engine is off?
There are several videos on youtube about Corvair valve clatter and adjustments. I'm just heading out to work so I don't have time to link to one right now.
Dave W. from Gilbert, AZ
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
66 Corsa 140/4 Yenko Stinger Tribute
66 Corsa 140 Coupe w/factory A/C
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5
64 Greenbrier 110/PG, Standard 6-Door
Re: Adjusting Rockers While Engine is off?
You did it right, the U should face "you" on both driver and passenger sides.
Are the push rods rubbing on the holes in the guide plates?
Are the push rods rubbing on the holes in the guide plates?
Re: Adjusting Rockers While Engine is off?
I just put lube on the major slide points on rocker and guide plate. It sounds fine now but I hear the engine kind of going like "vroom flat flat flat broom flat flat" at idle. You know how a really big muscle car sounds. It kind of sounds like that.
Re: Adjusting Rockers While Engine is off?
I adjusted the carbs with the unisyn sync tool and put the linkage on It without tension. Could it be the distributor timing retarded or something?
Re: Adjusting Rockers While Engine is off?
Why don't you just check the timing if you think it may not be correct?
Chris Brown
Member
Corvanatics: Director at Large
Ultra Van Motor Coach Club Vice President
CORSA
Member
Corvanatics: Director at Large
Ultra Van Motor Coach Club Vice President
CORSA
Re: Adjusting Rockers While Engine is off?
I will get around to it but was wanting to see what you thought. I don't know this might even be the way it should sound. I have never worked on corvairs let alone any car this old. I am not very experienced.