Go Back   Ford Mustang Forums > Mustang > 4.6 Mustang > 4.6L Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.


Reply   Post New Thread
Unread 09-23-2010   #1 (permalink)
MaDMaXX is offline Apprentice


Joined: Jan 2006
Posts: 58 Threads: 5
 MaDMaXX's Country Flag
Oregon from England
MaDMaXX is on a distinguished road
Default 1999-2004 Mustang GT timing chain replacement?

So the 4.6l lump in the 99-04 GT Mustang is a chain (belt on the front is accessory?)

This being the case, does the chain need replacing or just the auto tensioner?

Does the auto tensioner need "adjusting" like some of the old motorcycles? ie. loosen then allow it to auto adjust then tighten back up again?



PS, sorry for thread necro.
MaDMaXX is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Unread 09-23-2010   #2 (permalink)
wmburns is online now BOSS Member


Joined: Sep 2010
Posts: 4,800 Threads: 0
 wmburns's Country Flag
Houston   Texas
wmburns is a jewel in the roughwmburns is a jewel in the roughwmburns is a jewel in the roughwmburns is a jewel in the rough
Default

The timing chain on the 4.6 does not need adjustment. The chain tension adjusters are hydraulically controlled via oil pressure. It is normal to have “some” chain noise when first stated up while the oil pressure builds. The noise should go away in a few seconds.

That’s not to say the timing chains never need maintenance. It happens from time to time that the adjusting shoes will ware all the way through the plastic and down to the metal. Once this happens, there is nothing to control the slack and a catastrophic failure will result.

That is what happened to the motor in my 2000 GT.

Do not ignore excessive noises from the front timing chains (other than at initial cold start up). For a high mileage engine, get yourself an oil filter cutter. As part of regular maintenance, cut the filter open and look for bits of metal on the filter element. If there is metal to metal ware going on, the bits of metal will tell the tale.

Here is an example that I use since personally experiencing a motor failure. It is easy to use and now a part of my oil change routine.

http://www.amazon.com/Longacre-Oil-Filter-Cutter/dp/B000BO9KSS/ref=sr_1_1?s=automotive&ie=UTF8&qid=1285252302&sr= 1-1

Get yourself a mechanic's stethoscope. Probe around to see if any unusual noises can be located and or isolated.

With regards to your question about what needs replacing. Under normal situations, the entire timing set is good for the “life” of the motor. The definition of “life” varies. But let me state this emphatically. If I had to remove the timing cover to replace the adjustors or tension arms, I would also replace the chains. Reason? Over time they will stretch. It is a fair amount of work just to access the timing chains and re-time the motor. The 4.6 timing procedure is complicated and unfortunately the results of getting it wrong are often catastrophic.

Is there a reason you are asking questions along this line?
wmburns is online now  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 09-23-2010   #3 (permalink)
MaDMaXX is offline Apprentice


Joined: Jan 2006
Posts: 58 Threads: 5
 MaDMaXX's Country Flag
Oregon from England
MaDMaXX is on a distinguished road
Default

Short answer: i'm fairly ignorant to American V8's.

Thanks for the technical info though, very useful, how long do the auto tensioners last and are they easy to inspect?


I'm pretty much a jap guy, but it's so hard to find a 5-speed here, especially one that's not been molested by a monkey, so, my second 'love' is for the Mustang.

It's just not a car i'd otherwise choose, it's a Ford (had a bad name in England until around the turn of the century) and they still do things the Ford way for the most part.
However, the Mustang is a weakness of mine :blushed:


So the point being, i know what's involved in cam belt changing on your average Prelude or Accord etc. however, despite staring at many Mustang engine bays over the past week, i embarrassingly just assumed what i now believe to be the accessory belt, was the cam belt.

Guess i was just too distracted by the number of engines with empty coolant tanks!!
MaDMaXX is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 09-23-2010   #4 (permalink)
wmburns is online now BOSS Member


Joined: Sep 2010
Posts: 4,800 Threads: 0
 wmburns's Country Flag
Houston   Texas
wmburns is a jewel in the roughwmburns is a jewel in the roughwmburns is a jewel in the roughwmburns is a jewel in the rough
Default

My timing set gave out at 145 K miles. There are TONS of modular 4.6 in taxi service that routinely make it to 250K miles with no issues. So it is somewhat up to luck.

There is not an easy inspection procedure for the timing chain. The valve covers can be removed and a crude inspection can be done.

Otherwise, if you go to the work to remove the front timing covers, you might as well service it while you are there. Just my opinion.
wmburns is online now  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 09-23-2010   #5 (permalink)
MaDMaXX is offline Apprentice


Joined: Jan 2006
Posts: 58 Threads: 5
 MaDMaXX's Country Flag
Oregon from England
MaDMaXX is on a distinguished road
Default

Hmm, ok thanks.
MaDMaXX is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164