3rd & 4th Generation (1992–1996 & 1997–2001)Toyota Camry Discussion for years: 1992-1996 & 1997-2001
Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.
somebody said if the timing belt brakes on a toyota engine no damage will be done because its a non interference engine how is that so.. anyone wanna show me pics of how its not an interference engine. as far as i know the valve still sit on top of the pistons.. anyone care to explain?
Basically non-interference means that the valves and the piston will never occupy the same space. Thus if the timing belt breaks and the valves are stuck open, there is no way for the piston to hit them.
The valves don't open far enough for the piston to contact them at any point in the rotation of the engine, you can hold valves open when doing a timing belt and freely rotate an engine without damaging any valves.
Note not all Toyota engines are non-interference, many are. I believe all chain drive engines are interference, and the vvt-i 1jz/2jz engines are interference, and some of the vvt-i v6s
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Quote:
Originally Posted by Tony the Tiger
I mod my Camry because I am too cheap to go out and buy a real sports car
1992 Camry XLE v6: p&p + 3angle, CAI, y pipe, K-Sport coilovers, 5-speed swap
1996 Eagle Talon TSI AWD: IPT 3700 restall, DSMlink v3, HKS exhaust, ETS street fmic kit
Only if the wrong compression height valve springs, retainer/shims & bucket are installed.
The new GR blocks are int, the previous block v6's are all non, despite the "gates" confusion.
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"The lamest twice banned, non-female member of-all time." -Ekam, Thanks, I <3 you too! AIM/Yahoo Toysrme257th
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so your telling me that the engine is called non interference is because the valve has alot of space when the pistons come up to TDC? if so i got it..
why do you have to time everything up when doing a timing belt on a car when its non-interfence? is it so if u spin the camshaft gear by accident you'll know where to put it back because everything is lined up.. what happens if u don't bring the piston to TDC and just time the gears where the cam timing mark left off?
You have to have the timing correct because otherwise your engine will run like crap if it runs at all. For example, you don't want the valves opening during the power stroke or closing during the in exhaust stroke.
its a complicated answer, but yeah...
valve timing changes the powerband of the engine. it doesn't take much to make it run like a turd. plus on the older distributor position sensor engines. the mechanical timing of the distributor tells the ECU where the engine is in it's rotation. as you play with it, it changse ignition timing, and the timing of the fuel events.
and yeah, you got it. since the valves never intersect the pistons travel, regardless of what happens timing wise, they can never hit. barring other problems (like the retainers pop out, or grind off & the valve just drops into the cylinder).
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"The lamest twice banned, non-female member of-all time." -Ekam, Thanks, I <3 you too! AIM/Yahoo Toysrme257th
for anything, anytime; including camry turbos Now with Turbo!
no but if u just take the belt off wherever the valve and piston left off when u turn the key.. put the new belt on without moving the crank or camshaft pulley to much. shouldn't it be good.. its like its all frozen when u shut the car off.. so all u gotta do is just replace old belt and add new one. or nice illussion but it doesn;t work like that?
yes, this is what i do, but it is challenging to get all of the slack out of belt between the cam and crank gears. this past weekend i did this, but when i went to check the timing before i cranked over the motor, i was off by one notch.
edit: are you referring to if the belt breaks? then the odds of the cams and crank stopping spinning exactly at the same moment is impossible. the crank will have much more momentum.
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Last edited by ghettosled; 03-29-2007 at 09:27 PM.
maybe i'm saying it wrong.. more like just take the slack off the old belt.. leave all the gears where it was left off when engine is shut off and just put the new belt without movin any of the gears and fire up.. or it never work like that and u must always time?
yes its possible, but like i said, thats what i normally do but this past time when i checked the timing, it somehow got off by one tooth. it only takes a minute or two to check the timing, so why not make sure its correct while you are able to adjust it before everything is back together.
If you have the car apart to where you can put a new timing belt on, you can EASILY put the engine at TDC and line the cam pulley up, after you get tension on the belt you better be sure to rotate the engine a few times and check to see if it has jumped a tooth, there is just no telling whether or not you missed a tooth on the belt and the car will run like crap, it's better to just line it up and check it afterwards. Plus you feel like you did the job right
__________________
Quote:
Originally Posted by Tony the Tiger
I mod my Camry because I am too cheap to go out and buy a real sports car
1992 Camry XLE v6: p&p + 3angle, CAI, y pipe, K-Sport coilovers, 5-speed swap
1996 Eagle Talon TSI AWD: IPT 3700 restall, DSMlink v3, HKS exhaust, ETS street fmic kit
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