NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Other Technical Forums > The Daily Driver
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

The Daily Driver A technical forum for the ride that gets you to work every day.

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old May 16th, 2019, 20:06
bradleyheathhays bradleyheathhays is offline
NAXJA Forum User
 
Join Date: Sep 2010
Location: Lexington, KY
Posts: 263
timing belts and engine wear

I bought a 2011 Crown Vic with 300k miles 12 mos ago and I'm wondering how to approach servicing the timing belt. I know very little of it's past maintenance records other than what I've done with it this past year. Basically I'm wondering if I should go ahead and attempt to replace it now, or wait til something starts to go wrong. I don't know how timing belts typically go bad...if they just break or start to stretch or what. If this is an interference engine I'm imagining a fairly bad event so I'd like to get educated and be pro active about it.

Second...Scotty Kilmer teaches that the worst wear an engine sees after changing the oil is before the oil gets pumped back into the filter and then into the engine components during the first engine restart. But he says if you disable the ignition spark somehow when cranking for the first time again, the lack of combustion in the cylinders helps with reducing this kind of wear quite a bit. I don't have an owner's manual and I'm not sure what fuse to pull to disable combustion ignition, or if removing a fuse would be the best way to do this. Any opinions on how this should be done?
Reply With Quote
  #2  
Old May 17th, 2019, 05:35
old_man's Avatar
old_man old_man is offline
NAXJA Member
 
Join Date: May 2003
Location: Loveland, Colorado
Posts: 15,669
Re: timing belts and engine wear

Millions of oil changes every year and somehow this is a problem? If you are really worried, just fill the filter before you screw it on. It will cut the time drastically.

There is a coating of oil in each bearing that should protect things while the pressure is building up. The first time I start up a new engine, I have already prelubed the bearings with assembly lube, but I spin the oil pump and prime the system before turning over. This is mainly to get oil to the lifters. I still spin the engine with the coil wire removed and the plugs out to allow the lifters to pump up. After breakin I never worry.
__________________
Tom Houston - Former Colorado Chapter President , Terminal Adrenaline Junkie, and Rocket Scientist
Loveland, Colorado My teardrop build
You're just jealous because the voices don't talk to you.
Reply With Quote
  #3  
Old May 17th, 2019, 06:47
Rob Mayercik's Avatar
Rob Mayercik Rob Mayercik is offline
NAXJA Member #920
 
Join Date: Jun 2002
Location: NJ, U.S.A.
Posts: 2,282
Re: timing belts and engine wear

Timing belt systems have a tensioner that accounts for any stretch over the life of the belt.

I don't know whether your particular engine is interference or not, but if it is, a broken belt will cause significant (if not severe) internal damage to the engine. If it's not an interference type, the belt breaking will cause no damage but the engine will simply stop running, which could be bad if you're on the highway doing 60+ mph at the time.

Timing belt change intervals are specified in the standard year/mileage units, but since they are belts, if you hit the time but not the mileage you should change it anyway - being rubber, the belt does have a finite lifespan like tires. Replacement interval should be listed in the service section of the owner's manual.

Since you have no idea if/when the belt was last done, it should be changed as soon as possible - If it's original to the car (and you seem to have no way to confirm/deny that it is not), it's beyond both the age and mileage limits and could break at any time.

Additionally, given the age of the engine and the unknown service history, don't just change the belt itself. Replace EVERYTHING in the timing belt path - tensioner, all idler pulleys, and anything else the belt may be supplying drive to. That way you have a belt and belt path that's a known quantity.

(Example: my VW TDI has a timing belt, it's an interference engine, and the timing belt also drives the water pump and fuel injection pump. Replacement interval on my belt is 7 years/100K miles; doing the job right means belt, tensioner, all idler pulleys, and the water pump all together as a set.)
__________________
1992 Cherokee Laredo: "A wonderful balance of grace and rust"
1984 Dodge Omni
2002 Volkswagen Jetta GLS TDI
Reply With Quote
  #4  
Old May 20th, 2019, 20:54
trippled trippled is offline
NAXJA Member
 
Join Date: Apr 2006
Location: colorado springs, co
Posts: 2,287
Re: timing belts and engine wear

Ford 4.6 I'm assuming? That engine is timing chains. I've seen the guides break before, and yes they bend valves. It does not however have any recommended service interval. It requires removal of the valve covers and timing cover and then the 2 chains, sprockets and guides and tensioners.
Usually a rattling noise for a few seconds on a cold start means they're getting due for replacement. If a consistent rattle from the timing cover area they need to be done soon.
IDK who Scotty kilmer is but if the issue was that bad wed all be doing something different.
Reply With Quote
Reply


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

Posting Rules
You may not post new threads
You may not 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Two belts, one day in_motion OEM Tech Discussion 15 February 16th, 2019 10:23
Engine noise after timing chain replacement dodge2 OEM Tech Discussion 2 May 19th, 2009 06:37
Belts Rick Slayer OEM Tech Discussion 2 November 7th, 2008 14:57
Couple of MJ ?'s (Timing, engine noise) tchase OEM Tech Discussion 6 December 15th, 2004 16:50
Engine Ignition Timing Bill-93XJ OEM Tech Discussion 6 June 2nd, 2004 07:41


All times are GMT -7. The time now is 18:52.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014