timing chain tensioner(s) popped, motor=gone - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Gnnr · 08-05-2005, 07:04 AM

Yeah, so it finally happend. The tensioner(s) for the timing chain popped and now my motor is gone. I'm going to try and fix it.

What kind of damaged might have occurred in the engine? Anything fixable? If not, I'll just have to go get another KA (no money for anything else).

My fault for letting this happen, the engine rattle was getting louder and louder these past few days, should have done something sooner. Haven't oppend the block yet to see the damage, just want to know what to expect when I do, what to look for damage wise??? Thanks in advance.

SHIFT_control · 08-05-2005, 07:29 AM

unless you got very lucky, most of the valves will be bent, so a re-build on the head at a minimum. Personally, I would dissasemble the engine to assess the damage before sourcing a used motor. Just my .02

Gnnr · 08-05-2005, 10:32 AM

So worse case scenario is I have to rebuild the head? Or might there be something else? Anyone have any info (links) on rebuilding the head, I was going to have a friend do the job but he's not going to be able to help, have to take matters into my own hands.

Have to wait till the tow the car home before I can open her up, so I'm sitting here home wondering/worrying/planning....

***S14DB*** · 08-05-2005, 11:19 AM

Worse case scenario is that a valve kissed the piston and it's total rebuild time.

aznpoopy · 08-05-2005, 02:58 PM

was it a sohc?

swap the engine. you can have your car running again in a day or two.

Al_S14 · 08-05-2005, 07:45 PM

how many miles were on the engine?

Gnnr · 08-05-2005, 09:48 PM

Its a 95 240sx. DOHC. 136K miles. This car has gotten no loving, I can tell the previous owners didn't care much for maintnance. Maybe I should just get a lower milage KA, dunno...

evanl85 · 08-05-2005, 10:48 PM

Well, if the motor wasn't cared for anyway..then it might have other issues? A KA swap shouldn't cost too much, and if you find a good motor it'll easily last a long time.

Wei240 · 08-06-2005, 12:29 AM

yeah, ka swap is cheap as dirt, some shops (that does sr swaps) just tosses them away from customers...
depending on where you are, it's probably cheaper to swap ka then to rebuild one.. then again, it would REALLY be nice if you're going k-at and rebuilding it from ground up...

Al_S14 · 08-06-2005, 05:31 PM

Quote:

Originally Posted by Gnnr

Its a 95 240sx. DOHC. 136K miles. This car has gotten no loving, I can tell the previous owners didn't care much for maintnance. Maybe I should just get a lower milage KA, dunno...

o shit this makes me feel very very extra uncomfrtable

. my 98 just turned 140k and i its been rattling ever since i can remember.

damn i just hope it holds for another 3-4 weeks till i get a chance to put in my fresh KA.

Zen S14 · 08-06-2005, 07:04 PM

It is my understanding that KA is a none interference motor. Therefore, you should not have bent valves and stuff.

Gjohnson7 · 08-06-2005, 07:50 PM

Quote:

Originally Posted by Al_S14

o shit this makes me feel very very extra uncomfrtable

. my 98 just turned 140k and i its been rattling ever since i can remember.

damn i just hope it holds for another 3-4 weeks till i get a chance to put in my fresh KA.

Welcome to my world. My 93 KA just hit 180k and it's been rattling since I picked it up last November. I'm pretty sure that the previous owner knew nothing about maintnance also, since they said the car didn't even run and all it needed was a tune up.

Gnnr · 08-06-2005, 10:59 PM

Quote:

Originally Posted by Zen S14

It is my understanding that KA is a none interference motor. Therefore, you should not have bent valves and stuff.

Can anyone back this up?

Haven't opened the engine up yet, just got her towed home today from my job (where it died). Too depressed to open her up, won't have any money for another month to get it fixed. *sigh*

Zen S14 · 08-08-2005, 09:16 AM

My comment is based upon information from my friend who is a Nissan mechanic and he told me that it is a none interference motor and that a timing chain issue should not damage any valves. I am in the same boat you are due to a cam installation mishap so I have some personnal stake in this information as well.

SHIFT_control · 08-08-2005, 09:37 AM

I've seen SOCH KA's with slipped/broken chains with bent valves, they are interferance motors. Happened to me on my old POS hardbody pickup.

***S14DB*** · 08-08-2005, 11:09 AM

Quote:

Originally Posted by Zen S14

My comment is based upon information from my friend who is a Nissan mechanic and he told me that it is a none interference motor and that a timing chain issue should not damage any valves. I am in the same boat you are due to a cam installation mishap so I have some personnal stake in this information as well.

I guess your friend has never had a KA open then...

Zen S14 · 08-11-2005, 02:44 PM

DOHC motor at least there are no bent valves.

08-05-2005, 07:04 AM	#1
Gnnr Post Whore! Join Date: Apr 2005 Location: S. FL Posts: 3,960 Trader Rating: (0) Feedback Score: 0 reviews	timing chain tensioner(s) popped, motor=gone Yeah, so it finally happend. The tensioner(s) for the timing chain popped and now my motor is gone. I'm going to try and fix it. What kind of damaged might have occurred in the engine? Anything fixable? If not, I'll just have to go get another KA (no money for anything else). My fault for letting this happen, the engine rattle was getting louder and louder these past few days, should have done something sooner. Haven't oppend the block yet to see the damage, just want to know what to expect when I do, what to look for damage wise??? Thanks in advance.

08-05-2005, 07:29 AM	#2
SHIFT_control Leaky Injector Join Date: Mar 2005 Location: Golden Posts: 110 Trader Rating: (0) Feedback Score: 0 reviews	unless you got very lucky, most of the valves will be bent, so a re-build on the head at a minimum. Personally, I would dissasemble the engine to assess the damage before sourcing a used motor. Just my .02 __________________ '93 Pathfinder SE daily driver '93 HB blue (under construction) '89 Celica GTS RIP

08-05-2005, 11:19 AM	#4
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Worse case scenario is that a valve kissed the piston and it's total rebuild time. __________________ Comments should be taken as Opinions not as Statements of Fact

08-05-2005, 10:48 PM	#8
evanl85 Zilvia Member Join Date: Jul 2004 Location: Va Posts: 182 Trader Rating: (0) Feedback Score: 0 reviews	Well, if the motor wasn't cared for anyway..then it might have other issues? A KA swap shouldn't cost too much, and if you find a good motor it'll easily last a long time. __________________ 1993 Nissan 240SX SE Coupe

08-08-2005, 09:37 AM	#15
SHIFT_control Leaky Injector Join Date: Mar 2005 Location: Golden Posts: 110 Trader Rating: (0) Feedback Score: 0 reviews	I've seen SOCH KA's with slipped/broken chains with bent valves, they are interferance motors. Happened to me on my old POS hardbody pickup. __________________ '93 Pathfinder SE daily driver '93 HB blue (under construction) '89 Celica GTS RIP

08-05-2005, 10:32 AM	#3
Gnnr Post Whore! Join Date: Apr 2005 Location: S. FL Posts: 3,960 Trader Rating: (0) Feedback Score: 0 reviews	So worse case scenario is I have to rebuild the head? Or might there be something else? Anyone have any info (links) on rebuilding the head, I was going to have a friend do the job but he's not going to be able to help, have to take matters into my own hands. Have to wait till the tow the car home before I can open her up, so I'm sitting here home wondering/worrying/planning....

08-05-2005, 02:58 PM	#5
aznpoopy Post Whore! Join Date: Mar 2003 Location: New Jersey Age: 44 Posts: 5,013 Trader Rating: (1) Feedback Score: 1 reviews	was it a sohc? swap the engine. you can have your car running again in a day or two.

08-05-2005, 07:45 PM	#6
Al_S14 BANNED Join Date: Jan 2005 Location: Chesapeake VA Age: 40 Posts: 405 Trader Rating: (0) Feedback Score: 0 reviews	how many miles were on the engine?

08-05-2005, 09:48 PM	#7
Gnnr Post Whore! Join Date: Apr 2005 Location: S. FL Posts: 3,960 Trader Rating: (0) Feedback Score: 0 reviews	Its a 95 240sx. DOHC. 136K miles. This car has gotten no loving, I can tell the previous owners didn't care much for maintnance. Maybe I should just get a lower milage KA, dunno...

08-06-2005, 12:29 AM	#9
Wei240 Nissanaholic! Join Date: Sep 2002 Location: socal Posts: 1,778 Trader Rating: (0) Feedback Score: 0 reviews	yeah, ka swap is cheap as dirt, some shops (that does sr swaps) just tosses them away from customers... depending on where you are, it's probably cheaper to swap ka then to rebuild one.. then again, it would REALLY be nice if you're going k-at and rebuilding it from ground up...

08-06-2005, 07:04 PM	#11
Zen S14 Zilvia Member Join Date: Mar 2003 Location: Philadelphia USA Age: 48 Posts: 240 Trader Rating: (13) Feedback Score: 13 reviews	It is my understanding that KA is a none interference motor. Therefore, you should not have bent valves and stuff.

08-08-2005, 09:16 AM	#14
Zen S14 Zilvia Member Join Date: Mar 2003 Location: Philadelphia USA Age: 48 Posts: 240 Trader Rating: (13) Feedback Score: 13 reviews	My comment is based upon information from my friend who is a Nissan mechanic and he told me that it is a none interference motor and that a timing chain issue should not damage any valves. I am in the same boat you are due to a cam installation mishap so I have some personnal stake in this information as well.

08-11-2005, 02:44 PM	#17
Zen S14 Zilvia Member Join Date: Mar 2003 Location: Philadelphia USA Age: 48 Posts: 240 Trader Rating: (13) Feedback Score: 13 reviews	DOHC motor at least there are no bent valves.