|
Re: ever hear a sound like this?
[Re: theraif]
#1186572
02/26/12 09:20 PM
02/26/12 09:20 PM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
No. This one was reving great on the first fire-up. Straight to 5,000 rpm. But after headers were glowing a little, the guy who writes the EFI tune said that it's almost always from cam timing when the headers get hot like that,so i put a degree wheel and found that the dots lined up on this one put me at 116 installed intake centerline. Cam is on a 114 LSA, but is apparently supposed to be installed at 110, So I bumped it ahead 6 degrees.
The other engine I lined up the dots, but missed the correct dot, and ended up about 35 degrees off. THAT one wouldn't go over 3 grand, but is a-ok now
Needless to say, between these 2 trucks, it's been a rough couple weeks! And after these 2 engines, NEVER again will I just line up the dots!!
Last edited by 70Cuda383; 02/26/12 09:23 PM.
**Photobucket sucks**
|
|
|
Re: ever hear a sound like this?
[Re: Hot 340]
#1186576
02/26/12 09:50 PM
02/26/12 09:50 PM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
Tomorrow
Family time tonight. Just getting ideas of things to look at tomorrow
**Photobucket sucks**
|
|
|
Re: ever hear a sound like this?
[Re: 70Cuda383]
#1186577
02/27/12 04:34 PM
02/27/12 04:34 PM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
Ok, here's what I've found so far...
All rockers are getting oil it takes a few minutes of idle time, but eventually, oil flows through the rocker, fills up the middle and it spills over the roller tip and all over the valve.
pushrods do contact guide plates in a few spots, and have worn the black finish off in a few spots on the pushrods, but the metal is not galled up, there is no wear into the metal at all, it's still perfectly smooth to the touch. There is no room to adjust the guide plates, only option is to open the plates up a little bit so they don't rub.
LOTS of clearance through the head for the pushrods. holes are probably 7/16 or 1/2, and the pushrods are only 3/8, and are not anywhere near contacting the head anywhere, and there are no marks on the pushrods to indicate rubbing on the heads
removed the valve spring on the #2 exhaust valve, the valve is..."Sticky" is the best that I can explain it. I can move it up and down without much effort, but they do feel like they stick a little bit. without the valve spring on, I can let go of the valve, and it stays where I put it, it does not fall through at all.
--is that too tight? or "just right"?
there is wear on the valve stem from the roller rocker, indicating that the valves do not spin. should they spin like lifters do? I thought I've heard somewhere about valves rotating, but I don't see anything on this that would force them to rotate, especially with a roller rocker.
I'm going to open up the guide plates, maybe check a few more valves, and see what happens.
**Photobucket sucks**
|
|
|
Re: ever hear a sound like this?
[Re: FlyFish]
#1186579
02/27/12 05:05 PM
02/27/12 05:05 PM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
Quote:
I heard this exact same sound years ago with a Mallory Unilite distributor. The rotor was sitting too low and rubbing the distributor body....not sure if this is your issue, but the sound is the same squeaking I remember. 
stock distributor, EFI engine, but I'll check the rotor again. there's really nowhere for it to rub though, as there's the cam position sensor that's on a plate that's down into the body of the distributor, then the shaft sticks up 3 or 4 inches, and the rotor is up on top. there's nothing in between like on an electronic ignition distributor with the magnets and pick-ups etc.
**Photobucket sucks**
|
|
|
Re: ever hear a sound like this?
[Re: 70Cuda383]
#1186580
02/27/12 06:25 PM
02/27/12 06:25 PM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
did it again without the valve seal this time, and the stickiness is gone, but it's still..."firm" it moves smoothly, but it doesn't drop down under it's own weight.
**Photobucket sucks**
|
|
|
Re: ever hear a sound like this?
[Re: tubtar]
#1186583
02/28/12 09:57 AM
02/28/12 09:57 AM
|
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
|
Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
|
IMO the guides are fine, you don't want them loose. 1.6 rockers take alot of clearancing to work right and cause extra wear, like I said in the past. I don't see how you can set the valve lash accuratly with the engine running, almost impossible . IMO I set mine with the intake off so I can see what I'm doing. Good luck with it.  I now listened to your video, It sounds like the pushrods rubbing against the guide plates? Can't believe Mopar went to stud mounted rocker arms and guide plates! chevy... I thought shaft mounted rocker arms was better??
|
|
|
Re: ever hear a sound like this?
[Re: tubtar]
#1186584
02/28/12 09:58 AM
02/28/12 09:58 AM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
OP
Too Many Posts
|
OP
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
Quote:
I'm thinking thvalve should drop from it's own weight , so the guide is definitely tight......that dimension shrinks up as the motor builds heat.
Whether it is too tight or not I don't know.
Or whether it would sound like that or not.
I think I'd be pulling the heads.
Hmm...ok.
I'll check a set of stock magnum heads with 70K miles on them that I have here, and see how they feel so I have something to compare to, see if the valve falls through on it's own.
I think at this point, I'm going to finish trying to open up the pushrod guide plates so they don't rub, and run it, if it's still squeeks, then I'll pull the motor out, pull the heads and take them in for guide work, then pull the crank out and do the cam bearings, and then put it back together again.
I hate re-work! 
**Photobucket sucks**
|
|
|
Re: ever hear a sound like this?
[Re: Mr.Yuck]
#1186586
02/28/12 11:27 AM
02/28/12 11:27 AM
|
Joined: Jan 2003
Posts: 17,840
S.E. Michigan
ZIPPY
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 17,840
S.E. Michigan
|
Wow. Sounds like there is a bird caught in there somewhere! Only time I have encountered anything similar was with a 150,000 mile fan clutch, that would would lock up intermittantly....but you eliminated that kind of issue long ago. I think you're looking the right place (stem to guide) As a union trained master mechanic/machinist, tool and die maker with 30 years experience explained to me: As a general rule of thumb, .0008" is a magic number as far as normal human, layman capability to "feel" clearance goes. Clean, lightly lubed, near room temp, a wrist pin or a valve will usually fall through the hole under it's own weight at .0008". If it wiggles, either it's looser than .0008" and/or the parts have an irregular shape (not straight/round). If you have to push it through the hole with any pressure, it's going to be tighter than .0008" and/or the parts have an irregular shape (not straight/round). That might sound silly but I have put it to the test, and have found it to always be correct. I believe you're going to find the actual clearance is .0007, 7 ten thousandths of an inch or smaller. Personally I want .001 to .0025-ish stem to guide for most street apps To me, tight guides are an accident waiting to happen (what happens when a valve sticks open?) and could cost you an engine
Rich H.
Esse Quam Videri
|
|
|
Re: ever hear a sound like this?
[Re: ZIPPY]
#1186587
02/28/12 12:14 PM
02/28/12 12:14 PM
|
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
Moparnut426
I Live Here
|
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
|
I have heard a similar noise from a chain tensioner in the timming set dry, dont know if your running that or not. Also have heard the converter bolts being a tad slightly loose, and causing a swueak. That was in a 4x4 truck, and he used lock tight and didnt really tighten them up good and tight, and they didnt bounce and knock, but squeaked a tad at idle. Im sure you greased the oil seals before putting it together, or at least lubed them a bit, cause you would have burned the seal up if it was that dry and have oil everywhere. Also have replaced a few OE magnum distributors for a partially siezed/bent shaft causing the same noise. Good luck, and BTW did ya take the drive belt off??? LOL  Kasey
|
|
|
Re: ever hear a sound like this?
[Re: Moparnut426]
#1186588
02/28/12 03:50 PM
02/28/12 03:50 PM
|
Joined: Nov 2003
Posts: 7,348
Mt.Vernon ,Ohio
VernMotor
master
|
master
Joined: Nov 2003
Posts: 7,348
Mt.Vernon ,Ohio
|
Quote:
Good luck, and BTW did ya take the drive belt off???
LOL
Kasey
Dam you ! you made me get my keyboard wet !! LMAO
|
|
|
|
|
