406 sbc, build questions - Page 4 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #46 (permalink)  
Old 03-21-2010, 06:34 PM
Registered User
 
Join Date: Apr 2009
Location: Corning, NY
Posts: 62
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Some more detail: the noise continues through the RPM range, sound is still present with accessories disconnected (fan, alternator, steering pump, water pump...), pullies have been changed out to another stock set.

The oil pan is a cheapie chrome auto parts version - same with the timing cover. If you were to further troubleshoot, what would your method be? Right now is the ideal time to tear into things... the front clip isn't even bolted in.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #47 (permalink)  
Old 03-21-2010, 06:41 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 60
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 598 Times in 547 Posts
I would suggest a mechanic's stethoscope or a length of fuel hose held to your ear to isolate exactly where there's metal to metal contact.

Keep your body, cloths, hair , etc. away from the belts and revolving parts. No wristwatch or jewelry, either.

Don't use a long screwdriver for this. It works equally well as a stethoscope- and as a shish kabob stick for your brain.
Reply With Quote Quick reply to this message
  #48 (permalink)  
Old 03-21-2010, 06:51 PM
Registered User
 
Join Date: Apr 2009
Location: Corning, NY
Posts: 62
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Good point with the screw driver

Also, I'll remove all belts to minimize moving parts when listening.

Question:

I put a double roller timing timing gear set in it. Would the cheap timing cover not have enough clearance for this? If it didn't have enough clearance, I'm just not sure why it wouldn't be a consistant sound?
Reply With Quote Quick reply to this message
  #49 (permalink)  
Old 03-21-2010, 06:59 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 48
Posts: 9,874
Wiki Edits: 0

Thanks: 53
Thanked 623 Times in 553 Posts
Oil pan suggestion is a good one, my brother ran in to this with his 383 and a cheap chrome pan, front pair of rods just barely touched it ot the bottom of its stroke. We didn't find it until is was in the car and running too.
Reply With Quote Quick reply to this message
  #50 (permalink)  
Old 03-21-2010, 07:21 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,321
Wiki Edits: 326

Thanks: 839
Thanked 1,153 Times in 952 Posts
Pull the oil dipstick out and run it. Sometimes with the variations of parts that us guys use, the tip of the stick can be hit by a crank counterweight as it comes around.
Reply With Quote Quick reply to this message
  #51 (permalink)  
Old 03-24-2010, 08:58 AM
Registered User
 
Join Date: Apr 2009
Location: Corning, NY
Posts: 62
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Still Noise

I removed the fuel pump and rod, started the engine and the noise was still there. I also pulled the dipstick while it was running and the noise was still present.

With the belts off the front, I started the engine and felt both the timing cover and oil pan and didn't feel anything out of the normal. Someone mentioned that I should make sure that the harmonic dampener is fully seated because it holds the bottom timing gear tight. Is there any way to verify that the dampener is properly seated?

I think my next step is going to be tearing the front back down and looking inside the timing cover. Any additional thoughts?

Thanks
Reply With Quote Quick reply to this message
  #52 (permalink)  
Old 03-24-2010, 09:02 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 60
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 598 Times in 547 Posts
Have you tried using the piece of hose to listen with? This is something used by ALL mechanics, not just something that I dreamed up- you'd be amazed by what you can hear.
Reply With Quote Quick reply to this message
  #53 (permalink)  
Old 03-24-2010, 09:30 AM
Registered User
 
Join Date: Apr 2009
Location: Corning, NY
Posts: 62
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Good point, I was going to try and borrow a friends 'Mechanics Stethoscop' to search around. That would definitely help narrow down the area.
Reply With Quote Quick reply to this message
  #54 (permalink)  
Old 04-03-2010, 07:59 PM
Registered User
 
Join Date: Apr 2009
Location: Corning, NY
Posts: 62
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Problem solved!

I found the noise! Pretty embarrassed about my boneheaded mistake but either way, I'm pumped it wasn't anything major. I used one different cam screw (don't ask me why...) and it was making contact with the timing cover. I went out and bought a set of new screws with a locking plate and bolted it all back up. Everything sounds great!

I appreciate everyone's input and putting up with the multitude of questions
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
SBC Motor Build weshova Engine 4 10-21-2008 11:10 AM
1980 monte 406 SBC eatonde Engine 8 10-15-2008 08:00 PM
406 build up,,, need to have more HP tiresmoke55 Engine 34 09-01-2006 11:21 PM
383 Build Questions Mustangsaly Engine 3 06-14-2005 10:53 AM
sbc 350 build up questions b/w72 Engine 9 01-08-2004 06:12 PM


All times are GMT -6. The time now is 05:03 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.