Home | Register | Login | Contact Us

 
Auto Math
Classifieds
Forum
Gallery
Games
Garage
Tech Articles
Utilites
 
FAQFAQ    SearchSearch    RegisterRegister    Log inLog in    Log in to check your private messagesLog in to check your private messages    Forum Subscriptions1/4 Mile Table 

4.6 liter SOHC valvetrain issue

 
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Ford - Small Block
View previous topic :: View next topic  
Author Message
Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Fri Mar 09, 2007 2:56 pm    Post subject: 4.6 liter SOHC valvetrain issue Reply with quote

Has anyone seen a problem with these motors breaking valve springs? I have a motor that has 35K on it and one spring let go and the rocker dropped out. Made a hell of a lot of noise with it out I guess the valve was tapping against the piston. It is the exhaust valve 1st cylinder in the front on the passenger side. The vehicle it is in is an 2002 Explorer just a daily transportation for a friend of mine.

By the way the cam and rocker arm look fine no damage at all.


Last edited by Paul P on Fri Mar 09, 2007 9:15 pm; edited 1 time in total
Back to top
View user's profile Send private message
10sec.et
Member


Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Fri Mar 09, 2007 6:07 pm    Post subject: Reply with quote

dont usually see valvetrain problems like that with the 4.6. i checked for TSBs and didnt find any. my machinist couldnt provide an explanation either. maybe just a bad spring ??? i think beersngars works at a Ford dealer. maybe he could reasearch this through one of the techs.
_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

Back to top
View user's profile Send private message
Hanz
Moderator


Joined: 14 Mar 2003
Posts: 444
Location: Casselberry, FL
4953.56 points


2003 Dodge Ram

PostPosted: Fri Mar 09, 2007 7:02 pm    Post subject: Reply with quote

I had one a few years ago with a broken spring...when I ordered new ones from Ford they were a different style, that replaced the original...if my memory is right, the originals were a 'regular' for lack of a better word spring, and the replacements were beehive like is used now, and of course I then had to order matching retainers. I still have the ford package somewhere because I wanted to keep the part numbers... hth Hanz
_________________
www.hanzenginehouse.com
Back to top
View user's profile Send private message Visit poster's website
Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Fri Mar 09, 2007 9:20 pm    Post subject: Reply with quote

They are the beehive type as you stated Hanz. I can't figure it either. It is a salvage motor with low miles. This is easy to verify looking at the cam lobes. They have little to no tracking on them. Must just be a bad spring. The cams on the motor I pulled looked much different with tracks from the rollers on the cam lobes 130K miles. I will replace the spring with a new one from the dealer on Monday. This is if the valve is holding with a leak test. Thanks for the input guys.
Back to top
View user's profile Send private message
beersngars
Member


Joined: 04 Feb 2006
Posts: 390
Location: Ohio
13369.80 points


1948 Chevrolet Coupe

PostPosted: Sat Mar 10, 2007 8:08 am    Post subject: Reply with quote

10sec.et wrote:
dont usually see valvetrain problems like that with the 4.6. i checked for TSBs and didnt find any. my machinist couldnt provide an explanation either. maybe just a bad spring ??? i think beersngars works at a Ford dealer. maybe he could reasearch this through one of the techs.


I will check with one of the techs on Monday.
Back to top
View user's profile Send private message
Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Fri Mar 16, 2007 1:12 pm    Post subject: Reply with quote

Beersngars,
Anything??? Just wondering....
Back to top
View user's profile Send private message
beersngars
Member


Joined: 04 Feb 2006
Posts: 390
Location: Ohio
13369.80 points


1948 Chevrolet Coupe

PostPosted: Fri Mar 16, 2007 2:07 pm    Post subject: Reply with quote

Paul P wrote:
Beersngars,
Anything??? Just wondering....


OH Sorry... Embarassed
Talked to 2 top techs here and both have seen the problem, but no real pattern as to age or milage. Intake or Exhaust again no pattern. Also neither know of a redesinged spring. Sorry for the delay in response.
Back to top
View user's profile Send private message
PORTWORX PERFORMANCE
Newbie


Joined: 08 Jul 2007
Posts: 3
Location: INDY
184.10 points



PostPosted: Sun Jul 08, 2007 8:23 pm    Post subject: Reply with quote

i have personally work on 4 or more with this problem . the harmonics in the coil is the problem .. thats why ford started to use conical springs.
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Mon Jul 09, 2007 6:51 am    Post subject: Reply with quote

It was a conical spring that failed by the way. Must have been worse with out them.
I do have a used core 4.6 motor for sale that is in very good shape.

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Ford - Small Block All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
Home | Contact Us | Automath | Cam Files | Dyno Search | Forum | Garage | Picture Gallery | Reaction Timer

Copyright 1997-2016 SMOKEmUP.com All rights reserved.
Advertising Info     Disclaimer     Privacy Policy