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Re: Is the engine a non interference engine? Trying
Dear Unsure About Timing Belt Replacement......You are CORRECT ...this xterra motor does have whatthey call an interference engine in it.......and yes it does require exact placement and alignment of the cam to crank timing marks. Cam lock stabilizers are invovled for a pain free install of the timing belt.... If you have never done one before I would suggest that this not be your first attempt......try smaller and work up to something like this.......If you do need any more help though please get back to me....thx for your time!!!!!HOPE I COULD HELP!!!
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Everything points to non-interference. i have a 2005 ES330, I bought in 2007. Fabulous car. The timing belt was checked under warranty, mine was not a warranty replacement, of belt but as it was stripped down, I paid for a new belt anyway.
be VERY careful! Most engines are interference motors and a bust timing belt results in catastrophic failure when the valves contact the pistons because they are out of sync!
Timing belts usually come with markings - you would almost certainly find the compression TDC for cylinder 1 (not exhaust TDC - if the air blows thru plug hole when piston is rising its compression - if the air is NOT blowing out plug hole its exhaust tdc - rotate once more).
Now you will have to find the timing marks on the camshaft(s) and set according to the manual.
I assume it's your timing belt, not a chain, which rarely, if ever snap. Depending on the make of the car and the engine you may, or may not, have serious engine damage.. DO NOT ATTEMPT to start the car, have it towed to your shop of choice. If there is no engine damage a timing belt replacement generally will run you 2 or 3 hundred bucks...if you did serious engine damage you may have to decide if the car if worth the money to have it repaired. What you need to know is whether your car has an "interference" or "non-interference" type engine.. In an interference type engine if the timing belt breaks the valves will "interfere" with the pistons as they travel up if the timing belt breaks, which results in generally catastrophic engine failure.. non-interference engines generally suffer little or no engine damage with a broken timing belt.. I broke a timing belt on my 1990 Toyota Supra going 70mph, but it was a non-interference engine and after having the belt replaced it was fine.. here is a good list someone put together on what type of engine is in your car.. you should find the engine type either marked on the engine or on a label under the hood, or the owners manual.. good luck. http://yourcarangel.com/2014/07/interference-engines-complete-list/
Your 2.0L is an interference engine. Since this engine is "SOHC" the timing belt will be easier than the larger 2.4L DOHC engine. When you are ready to perform the repair, please consider buying the timing belt kit. It includes a new water-pump and belt tensioner. If you have any other questions, feel free to write back. Please let me know how the repair goes, good luck.
Did you get it timed correctly? You don't just replace them like a fan belt, there is a procedure and marks that you line up. Your engine may be a non-interference or interference which means that if your timing belt breaks your pistons may hit your valves and cause major engine damage. Non-interference means that when the belt breaks it won't interfere and cause damage. Interference means that it will. I don't know what engine you have in your car but if you call a dealer and tell them what engine you have in your car they should be able to tell you if it is a non-interference or interference engine.
Your timing belt should be replaced every 50-70,000 miles. Carmakers
have specified the replacement intervals for timing belts. In this
database you will find these timing belt replacement intervals along
with a little technical information regarding the valve configuration -
interference or non-interference. In an interference engine, the valves
and piston share the same air space. They never touch, unless your
timing belt breaks or skips, and this is a catastrophic failure that
requires removing the head and replacing bent valves. Non-interference
engines do not risk this contact if the timing belt goes. Nonetheless,
either can leave you stranded, so regular timing belt replacement is
Most Ford vehicles from 1985 and up have enough valve clearence so the valves do not get hit when the timing belt snaps. Since I worked for ford for many years I have only seen one with valve damage and the youg man said he was driving his car really hard at high RPM's. I believe you will be okay on your engine as long as when the belt broke the engine was not at high rpm's. If know one has told you those engine recommend a timing belt replacement every 60k. I hpe this helped and I hope this fixes your problem. Good luck, Roger
You just have to try it. The best thing to do is try adjusting the valves. The settings are under the hood. They valves should be pretty close to what the clearances should be. If any are WAY LOOSE you may have a bent valve. If they seem OK, replace the belt. Be sure to replace the balancer belt also.