Non-Supra Related Timing Chain-240sx

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huntin5L

Member
Mar 31, 2005
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Niles, IL
Guys,

I have a 240sx that im trying to fix so i can get rid of it from my driveway. It was a car I had before I got my 89T supra. The timing chain looks like it jumped when i was driving it around last summer, but i think i wasn't going fast enough to cause any damage (conflict engine), Ive posted on the 240sx forum, but nobody there seems to post as often as they do here and thought maybe you knowledgable supra guys could help me out. Maybe some of you have one and have done the timing chain.

Im in the process of making sure the motor is at TDC, which I think I got. Now the distributor looks okay, i took off the distributor cap and the inside rotor is pointing pretty close to the number 1 plug, which goes to show it is at TDC. My question is though when this chain jumped what do I have to do to remedy the valve timing. That obviously has to be off if the chain jumped, correct? Any info I would greatly appreciate it.

I have pics located here, I don't expect to have all the answers as this isn't a 240 forum, but i thought what the hell, maybe someone has one.



Anyway here are the pics.


http://www.freepichosting.info/hpics/show.php?img=583461DSC00831552.jpg

http://www.freepichosting.info/hpics/show.php?img=34037DSC00832623.jpg

http://www.freepichosting.info/hpics/show.php?img=59238DSC00836691.jpg
 
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Nick M

Nick M

Black Rifles Matter
Sep 9, 2005
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With out looking at the pics, you need to find out if it is an interference engine or not. Don't turn the cams over.
 
Figit090

Figit090

Fastest mk3 GT4 1/4 mile!
Jan 7, 2006
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not to steal the show, but i'm guessing interference motor means the valves will smack the piston/eachother if the timing chain snaps....right?

if so, are any of the supra motors interference motors? i mainly want to know about the 7m since i have one, but if someone knows info on the jz's i'm also curious.

on a non=interference motor, no damage should occur if the timing belt snaps right?
 
Poodles

Poodles

I play with fire
Jul 22, 2006
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none of the supra motors are interferance motors from the factory, if you're running big cams, high compression, ect, they MIGHT be interferance, your machines shop should be able to tell you all this...

man, don't even see any marks on top to get the timing right, I dunno about that motor...
 
H

huntin5L

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Mar 31, 2005
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Niles, IL
The chain is loose, but i was told by an ex-mechanic that i probably wasn't going fast enough to cause any damage if that makes any sense. If i remember i wasn't doing more than 30, i think it was more closer to 25mph. He said if i was on the highway that it would of been done.
 
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MKIIINA

Destroyer of Turbos
Mar 30, 2005
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it doesnt matter how fast you are going its how fast the engine is spinning. if the chain broke and the motor kept turning (intertia) then you might have bent alot of parts in the head. even if you crank it it could damage valves and pistons.

the 7m is non interfierance
 
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huntin5L

Member
Mar 31, 2005
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Niles, IL
The chain did not break, it is intact, on these cars it is usually the guide that breaks. I didn't see any pieces in the oil so that is a good sign.
 
H

huntin5L

Member
Mar 31, 2005
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Looks like it jumped two teeth, but i still have to check the crank gear to see if that is off by two teeth, then i will have a better idea. But if it is off by two teeth how would i make the adjustment, meaning would i turn the cam gear or the crank gear? That is the biggest concern to get it set right.
 
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huntin5L

Member
Mar 31, 2005
657
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Niles, IL
Well I didn't see until today, but it looks like my camshaft is busted in half :( Not to mention it is an interference motor so im sure it is safe to say the motor is done. Does anyone know where you can get like a cheap borescope or something to look into the cylinder to see what happend. The reason i ask is because i don't feel like taking the head off arggggh!!
 
NashMan

NashMan

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Aug 5, 2005
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dude your motor is done you can get away wiht really badly streched chian but one now that ther cam is broke your car is broke
 
Nick M

Nick M

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Jeff Lange said:
Generally speaking of Toyota motors, if it has a timing belt it is non-interference, and if it is interference, it will have a timing chain.
Click to expand...

When I left, the new 4.0 V6 was interference. I think the 2ZZ-FE was also, but maybe not.
 
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