timing chain alignment
Thread Starter
|
Freshman User
Joined: Mar 2007
Posts: 28
Likes: 0
timing chain alignment
<TABLE width="100%" border=0 itxtvisited="1"><TBODY itxtvisited="1"><TR itxtvisited="1"><TD vAlign=top itxtvisited="1">doing valve job on '97 F-150 4wd, Haynes manual is confusing.
4.6 EFI-SOHC (R)
According to manual:
Removal:
"When positioning the engine at TDC for number 1 piston, look at the keyways on the camshaft sprockets. Use a square to insure that each keyway is at 90-degrees to the valve-cover mounting surface of the cylinder head. then install the camshaft positioning tool on the rear of the camshafts."
Installation:
"The two timing chains should each have two bright or colored links.The links seperate the chain into two equal halves. If no colored links are present, lay the chain down, make a paint mark on a link, then count links and make another paint mark halfway around the chain"
"Install the left timing chain, aligning its colored link to the mark on the crankshaft sprocket and to the timing mark on the camshaft sprocket.
Install the right timing chain, and its crankshaft sprocket. When both chains are installed and all colored links and marks aligned, the keyways should be at 90-degree angle to the valve-cover mounting surface of the cylinder head."
Actual:
Removal:
Did not use the camshaft positioning tool but did insure that keyways were at 90-degrees to the valve-cover mounting surface of the cylinder head. After I took the tensioners off the chain was still under tension due to valve spring pressure, and when I took the chain off, the camshafts rotated slightly.
Assembly:
Put camshaft at near 90-degrees when heads were reassembled.
Put chain mark on crankshaft sprocket mark and placed sprocket on crankshaft. Crankshaft sprocket mark at 6:00.
Put camshaft sprocket on but when keyway is at 90-degrees the dimple in sprocket will not line up with mark on chain.
The dimple is at about 4:00 (keyway at 12:00) mark lines up with keyway but no tension is on chain. I can rotate the camshaft a tooth or two to put chain back under slight tension (so keyway is at 90-degree angle to the valve-cover mounting surface of the cylinder head) but marks do not line up.
How should I proceed? any and all help will be greatly appreciated.
</TD><TD itxtvisited="1"> </TD><TD vAlign=top height="100%" itxtvisited="1">
4.6 EFI-SOHC (R)
According to manual:
Removal:
"When positioning the engine at TDC for number 1 piston, look at the keyways on the camshaft sprockets. Use a square to insure that each keyway is at 90-degrees to the valve-cover mounting surface of the cylinder head. then install the camshaft positioning tool on the rear of the camshafts."
Installation:
"The two timing chains should each have two bright or colored links.The links seperate the chain into two equal halves. If no colored links are present, lay the chain down, make a paint mark on a link, then count links and make another paint mark halfway around the chain"
"Install the left timing chain, aligning its colored link to the mark on the crankshaft sprocket and to the timing mark on the camshaft sprocket.
Install the right timing chain, and its crankshaft sprocket. When both chains are installed and all colored links and marks aligned, the keyways should be at 90-degree angle to the valve-cover mounting surface of the cylinder head."
Actual:
Removal:
Did not use the camshaft positioning tool but did insure that keyways were at 90-degrees to the valve-cover mounting surface of the cylinder head. After I took the tensioners off the chain was still under tension due to valve spring pressure, and when I took the chain off, the camshafts rotated slightly.
Assembly:
Put camshaft at near 90-degrees when heads were reassembled.
Put chain mark on crankshaft sprocket mark and placed sprocket on crankshaft. Crankshaft sprocket mark at 6:00.
Put camshaft sprocket on but when keyway is at 90-degrees the dimple in sprocket will not line up with mark on chain.
The dimple is at about 4:00 (keyway at 12:00) mark lines up with keyway but no tension is on chain. I can rotate the camshaft a tooth or two to put chain back under slight tension (so keyway is at 90-degree angle to the valve-cover mounting surface of the cylinder head) but marks do not line up.
How should I proceed? any and all help will be greatly appreciated.
</TD><TD itxtvisited="1"> </TD><TD vAlign=top height="100%" itxtvisited="1">
<!-- begin ad tag (tile=4) -->******** language=JavaScript type=text/javascript>document.write('******** language="JavaScript" src="http://ad.doubleclick.net/adj/fordtrucks.tmus/category;category=Performance_Engines_and_Troubles hooting__Modular_V8_46L_54L;tile=4;dcopt=ist;sz=30 0x250;ord=' + ord + '?" type="text/javascript"></scr' + 'ipt>');*********>******** language=JavaScript src="http://ad.doubleclick.net/adj/fordtrucks.tmus/category;category=Performance_Engines_and_Troubles hooting__Modular_V8_46L_54L;tile=4;dcopt=ist;sz=30 0x250;ord=8438250764543860?" type=text/javascript>*********>******** src="http://static.internetbrands.com/partners/afc/afc_glue.js?" type=text/javascript>*********>******** src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type=text/javascript>*********>********> window.google_render_ad(); *********>******** language=JavaScript1.1 src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-ib_autoenth_sede_1&dt=1226843923750&adsafe=medium& oe=utf8&lmt=1226843923&skip=1&num_ads=4&output=js& adtest=off&correlator=1226843922281&dblk=1&channel =FordTrucks_Forums_300%2CFord-Trucks_Domain&pv_ch=Ford-Trucks_Domain%2B&url=http%3A%2F%2Fwww.ford-trucks.com%2Fforums%2F793261-4-6-romeo-timing-chain-alignment.html&ad_type=text,image,flash,html&image _size=300x250&ea=0&ref=http%3A%2F%2Fwww.ford-trucks.com%2Fforums%2Fsearch.php%3Fdo%3Dprocess&fr m=0&ga_vid=3547364673110832600.1226783176&ga_sid=1 226837677&ga_hid=1938228617&ga_fc=true&flash=9.0.1 24.0&u_h=768&u_w=1024&u_ah=738&u_aw=1024&u_cd=32&u _tz=-300&u_his=3&u_java=true&dtd=78">*********>********>vu("http://pagead2.googlesyndication.com/pagead/adview?ai=BA7hbGicgSY34NY7InQbd-NijBb79jnLKibOGCeT-_LUFABABGAEg6_X5CTgAUIDH4cQEYMnOtYfco_AQsgETd3d3Lm ZvcmQtdHJ1Y2tzLmNvbboBCjMwMHgyNTBfanPIAQnaAU5odHRw Oi8vd3d3LmZvcmQtdHJ1Y2tzLmNvbS9mb3J1bXMvNzkzMjYxLT QtNi1yb21lby10aW1pbmctY2hhaW4tYWxpZ25tZW50Lmh0bWyY AvAuuAIYwAIByALa9dwGqAMB6AMv6APIBugDWfUDAAEAAPUDBA AAAJgEAA&sigh=I9Bw6L-TGGc");*********>******** language=JavaScript1.1 src="http://ad.doubleclick.net/adj/N3880.google.com/B3092750.15;dcove=o;sz=300x250;click=http://pagead2.googlesyndication.com/pagead/iclk?sa=l&ai=BA7hbGicgSY34NY7InQbd-NijBb79jnLKibOGCeT-_LUFABABGAEg6_X5CTgAUIDH4cQEYMnOtYfco_AQsgETd3d3Lm ZvcmQtdHJ1Y2tzLmNvbboBCjMwMHgyNTBfanPIAQnaAU5odHRw Oi8vd3d3LmZvcmQtdHJ1Y2tzLmNvbS9mb3J1bXMvNzkzMjYxLT QtNi1yb21lby10aW1pbmctY2hhaW4tYWxpZ25tZW50Lmh0bWyY AvAuuAIYwAIByALa9dwGqAMB6AMv6APIBugDWfUDAAEAAPUDBA AAAJgEAA&num=1&client=ca-ib_autoenth_sede_1&adurl=;ord=1840528473?">******* **>
<!-- Template Id = 2594 Template Name = Banner Creative (Flash) - In Page Multiples --><!-- Copyright 2006 DoubleClick Inc., All rights reserved. -->******** src="http://m1.2mdn.net/879366/flashwrite_1_2.js">*********><NOSCRIPT></NOSCRIPT><NOSCRIPT></NOSCRIPT><!-- End ad tag -->
</TD></TR></TBODY></TABLE>
<!-- Template Id = 2594 Template Name = Banner Creative (Flash) - In Page Multiples --><!-- Copyright 2006 DoubleClick Inc., All rights reserved. -->******** src="http://m1.2mdn.net/879366/flashwrite_1_2.js">*********><NOSCRIPT></NOSCRIPT><NOSCRIPT></NOSCRIPT><!-- End ad tag -->
Freshman User
Joined: Apr 2003
Posts: 31
Likes: 0
From: Corydon, IN USA
I'm feeling good that you never got a response because I'm there right now. I question whether or not I set the key ways properly so I backed the bolt off of the camshaft sprocket and found that they are not even matching up along with the bright links on the chain with the dimples on the sprockets. So how do I do a do over on resetting the chains? Or am I freaking out for no good reason?
Woodlums
Woodlums
