PUSH RODS CHEWED UP?.

Page 1 of 3 1, 2, 3  Next

View previous topic View next topic Go down

PUSH RODS CHEWED UP?.

Post  powerstrokeace on April 29th 2012, 11:53 pm

OK this is the motor that was freshened up this last winter. Rings bearings the normal deal. The only things different was the correct 1.73 rocker arms (use from Jon) and a new cam from Lem. Thats it. Well we made 13 runs on the throttle stop deal and did the normal minor checks. We checked the Valve lash after the first 4 runs and the left side was ok. The right side had a few that needed some adjustment no more than .003. So today I drove that car off the stop to see why the kids reaction time sucked so bad and ended up going rounds. after 4 rounds we noticed some abnormal engine noise and right after the run i jump out and pulled the right cover and found one valve maybe .003 out. put the cover back on and headed for the lanes but the noise was still there. Well at one time there was a exhaust probe in the #1 pipe and my kid noticed the pop rivet was gone so I just passed it off as exhaust noise. Made one more run (lost -.020 red) and mainly I was uncomfortable with what was going on. So get the car home and get the cover off and started checking valve lash and notice most of them were to tight (?) and one .013 loose. So I rip the intake off looking for a bad roller lifter and found nothing. But there is metal on the magnets I have in the lifter valley. So I remove all the rocker arms and push rods and lifters and found several push rod tips chewed up. Now this is not from lack of oil. So with all the metal I think I need to pull the motor out and look at all the bearing and oil pump. What do you guy's think?

Ace

powerstrokeace

Posts: 1394
Join date: 2009-09-07
Location: colorado

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  cool40 on April 30th 2012, 12:03 am

if you reset the lash hot it would close up when cooled off.if it's oiling the top end it should'nt have issues.i guess you spun the pump with a drill to check?

cool40
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts: 5939
Join date: 2009-08-31
Age: 43
Location: on the 1/8 mile dyno

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  powerstrokeace on April 30th 2012, 12:16 am

RIght after I made that pass and took off the right side i found a few that were tight. But didn't have the time to relash them as they were calling us back to the lanes to be paired up. I normally set may lash Cold and between .003-.004 tight. I know when it warms up they get loose. I'm more worried about tearing the bottom end down now. Man I hate to have to re-ring this thing.

Ace

powerstrokeace

Posts: 1394
Join date: 2009-09-07
Location: colorado

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  cool40 on April 30th 2012, 12:22 am

powerstrokeace wrote:RIght after I made that pass and took off the right side i found a few that were tight. But didn't have the time to relash them as they were calling us back to the lanes to be paired up. I normally set may lash Cold and between .003-.004 tight. I know when it warms up they get loose. I'm more worried about tearing the bottom end down now. Man I hate to have to re-ring this thing.

Ace
i would'nt rering it unless i found a problem with the rings.what part of the p/r is chewed up?

cool40
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts: 5939
Join date: 2009-08-31
Age: 43
Location: on the 1/8 mile dyno

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  dfree383 on April 30th 2012, 12:26 am

Have you checked the springs?

dfree383
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts: 11249
Join date: 2009-07-09
Location: Everywhere

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  bbf-falcon on April 30th 2012, 8:09 am

X2 Dave and how was the lifter/rocker that the chewed up pushrod was in?

bbf-falcon

Posts: 8235
Join date: 2008-12-03
Location: Jackson, Ohio

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  powerstrokeace on April 30th 2012, 8:19 am

The rocker cup looks ok. It's mostly the push rod end but the lifter end as well. I have plenty of spring clearance. This is what kept me up all night. Old cam was a Lunati as well as the lifters. New cam is a Comp and new Lunati lifters. Now the oil channel in the Lunati lifter is roughly .015 smaller and .100 lower than the comp lifter oil channel. Now I wondering what base circle Lunati and Comp grind in there cams.I ran in to something like this years ago with a small block car. Switched cams from a solid to a roller and it had a smaller base circle and it cut oil flow off to the lifters. There a modification you perform to the lifters to cure this.

NO I didn't PRIME the motor with a tool and check this. So I will put the lifters back in and dump the oil (strain it for particles)back in and do this. I have a fresh set of Comp lifters on the shelf to compare this with. And the block doesn't have lifter bushings

Ace

powerstrokeace

Posts: 1394
Join date: 2009-09-07
Location: colorado

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  bbf-falcon on April 30th 2012, 8:30 am

I've only had that happen one time.I replaced the lifter/pushrod and it's never happened since. I just took it to be poor oiling to that one on startup. If all the lifters were wrong you would think all would look the same. Question

bbf-falcon

Posts: 8235
Join date: 2008-12-03
Location: Jackson, Ohio

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  56Tbird on April 30th 2012, 9:32 am

I've had to replace pushrods before because of chipping on the ends,but they never lost any lash. Just caught them starting to come apart early. But , I never had anymore trouble after that,and the pushrods were old. If you lost more than .010 lash ,you got a problem I think. I'd be checking everything real close..Good luck

56Tbird
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts: 5141
Join date: 2008-12-02
Age: 55
Location: Hawesville,Ky.

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  dfree383 on April 30th 2012, 2:42 pm

What springs are you running and how old are they? Some of Lems cams are pretty aggressive.

dfree383
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts: 11249
Join date: 2009-07-09
Location: Everywhere

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  Doug Rahn on April 30th 2012, 7:54 pm

Here's a good read. http://www.mooregoodink.com/news/?p=3225

Doug Rahn
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts: 1258
Join date: 2009-08-07
Age: 63
Location: Springfield, GA

View user profile http://www.cardomain.com/ride/228081

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  c.evans on April 30th 2012, 8:57 pm

Are the pushrods rubbing against the pushrod holes? Are the guideplates aligned?

Charlie

c.evans
BBF VENDOR SPONSOR
BBF VENDOR SPONSOR

Posts: 2161
Join date: 2008-12-03

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  DILLIGASDAVE on April 30th 2012, 10:33 pm

I once had a run of bad luck with Cleveland pushrods chewing/chipping the tips. They were Manley 3/8 pushrods with Crane gold roller rockers.

I got a lot of different suggestions back then to fix the problem, most didn't help. What did stop the damage was a combo of polishing the pushrod tips & pushrod cups in the rocker arms, combined with lubeing the contact point between the tip & the cup with black moly hyd/solid cam breaking lube before their first use.

Don't really know why it helped stop the damage. Only thing I can figure is polishing the two mating surfaces might have reduced the friction a given amount during the initial break-in run.

DILLIGASDAVE

Posts: 1814
Join date: 2009-08-08
Location: Texas. pronounced "texASS"

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  jbozzelle on April 30th 2012, 10:58 pm

c.evans wrote:Are the pushrods rubbing against the pushrod holes? Are the guideplates aligned?

Charlie


My thought too? Are the pushrods binding and causing the rocker to skip across the pushrod tip?

jbozzelle

Posts: 2761
Join date: 2009-08-10
Age: 40
Location: New Orleans

View user profile

Back to top Go down

Re: PUSH RODS CHEWED UP?.

Post  powerstrokeace on May 1st 2012, 12:23 am

OK I'm going to get razzed for this. In the past I've used nothing but Comp cams lifters. This motor came with the car and had the Lunati roller lifters. I talked with Lem today and we talked about base circles and then lifters. He said some thing about 90˚ for the oil hole on Comps and 180˚ for the Lunati. if you look at Comps stuff they have 2 oil holes that are 90˚ each direction from the vertical bar mount. Basically parallel to the oil passage. Lunati has 1 oil hole that is just under the vertical bar. So this mean the Lunati lifter MUST have the vertical bar installed facing toward the outside of the center. Not toward the center as Comps are. SO YES I F**KED UP AND PUT THEM IN BACKWARDS!!!!!!!!!!!!!!

http://www.lunatipower.com/Product.aspx?id=839&gid=214






Now I just need to figure out how to clean up this mess...

Ace

powerstrokeace

Posts: 1394
Join date: 2009-09-07
Location: colorado

View user profile

Back to top Go down

Page 1 of 3 1, 2, 3  Next

View previous topic View next topic Back to top


Permissions in this forum:
You cannot reply to topics in this forum