whats more common? wrist pin,rod,or bearing noise?

supraduper · 12-13-2008, 07:42 PM

as the title says... whats more common on these engines 7mge...

i have a light knocking noise under certain conditions (2200 rpms light load, up as far as ive gone 4000 rpm)... to me it sounds like a wrist pin...

is this unheard of?

whats common on these motors?

CyFi6 · 12-13-2008, 11:26 PM

do you hear it at idle? Does it sound more like a double knock or is the speed of it consistent? You could also have valve noise. Theres really a lot of things that can make knocking noise including a cracked flexplate etc..

supraduper · 12-14-2008, 01:24 AM

noise is not at idle... runs smooth, aside from the oem wires, which make it skip a lil...

noise is heard when cruising at a steady speed, with the rpms above 2k...
again light throttle crusing speed, its like a rattling sound.... if i gas on it gets a little louder and subsides shortly untill i get above 3k. then it gets more rapid the higher the rpms....

it does have the sound of a wrist pin, as in its maybe a double knock... but i hadnt heard of anything like that with these engines, just the crank bearings....

is this possible to have a bad wrist pin with 117k on the motor??

CyFi6 · 12-14-2008, 01:28 AM

Anything is possible. Get a mechanical oil pressure tester gauge and check your oil pressure.(not the stock one)

supraduper · 12-14-2008, 01:46 AM

i have one... im a mechanic... so i have an idea what im listening to... but i come from honda world.... this is my first toyota..... and what a f'n ride.... so much torque... its more like an american muscle car than an import

but yea.... oil pressure is good... at least its not super low

i was trolling craigslist and it seems that most of them on there have engine noises in the lower end.... can they not take the abuse?

CyFi6 · 12-14-2008, 01:53 AM

The 7mge should last you many many miles, just depends on how it was previously maintained. Use a stethoscope to further narrow what the noise is. As i said it could be a multitude of things... Its not like the 7mge has a tendency to do any one thing. How it was treated in the past dictates what has happened now, there's nothing else to really say.

Chambers · 12-14-2008, 02:56 AM

My 7M-GE has a very similar sound, and my father took a listen and said its probably wrist pin knock. I'm not sure though, because I have put over 22K miles on and taken it to the track a few times and it hasn't blew up yet. Just this past October it blew the head gasket, I had the head re-furbished so I know its not the head making any noise because the tap that it did have has been resolved by a shim job.

On a couple occasions when I start it up, and while holding the clutch pedal down I hear a very audible scraping sound. I let the pedal up and the sound subsides, I push it back in and the sound returns. After one or two pumps the sound pretty much goes away for good. The clutch master cylinder is fine, fluid is topped off. I'm starting to think my pilot bearing is bad and has been like that for some time, and that has caused some ill effects on the clutch assembly and that's whats knocking. The only problem with that is that the sound appears as if its inside the block, about three cylinders back.

The first time my father listened, he used a makeshift stethoscope and heard the sound from the head. I have yet to stop by to have him give a listen since the head gasket repair though.

The 7M engines in general have a tendency to blow head gaskets and develop rod knock, but there is a distinct difference between the sound of rod knock and this mysterious knock in the 7M. I know this because my friends 7M-GTE just got a serious case of rod knock, it makes my knock seem like it supposed to be that way.

At any rate, keep us updated and I will as well. Good luck.

CyFi6 · 12-14-2008, 05:22 AM

my 7mge also has a mysterious knock noise, but only at idle. I have taken it to the autocross course, and i abuse it every day and it hasn't really gotten worse, so i cant say i really know what it is. I suspected wrist pin as well but it isnt a double knock and my car is too low to use a stethoscope, and i have no access to a lift.

Chambers · 12-14-2008, 11:44 PM

Well I guess its a question of time and who, then we may decipher what this knock is by that someone re-building there engine. lol. Hate to have it that way but thats the way its looking to be, but hey, as long as it still runs why complain.

Good luck.

CyFi6 · 12-15-2008, 01:24 AM

pretend it isnt making noise and you will be stress free

12-13-2008, 07:42 PM	#1
supraduper Stock Join Date: Dec 2008 Location: nh Posts: 14	whats more common? wrist pin,rod,or bearing noise? as the title says... whats more common on these engines 7mge... i have a light knocking noise under certain conditions (2200 rpms light load, up as far as ive gone 4000 rpm)... to me it sounds like a wrist pin... is this unheard of? whats common on these motors?

12-14-2008, 02:56 AM	#7
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	My 7M-GE has a very similar sound, and my father took a listen and said its probably wrist pin knock. I'm not sure though, because I have put over 22K miles on and taken it to the track a few times and it hasn't blew up yet. Just this past October it blew the head gasket, I had the head re-furbished so I know its not the head making any noise because the tap that it did have has been resolved by a shim job. On a couple occasions when I start it up, and while holding the clutch pedal down I hear a very audible scraping sound. I let the pedal up and the sound subsides, I push it back in and the sound returns. After one or two pumps the sound pretty much goes away for good. The clutch master cylinder is fine, fluid is topped off. I'm starting to think my pilot bearing is bad and has been like that for some time, and that has caused some ill effects on the clutch assembly and that's whats knocking. The only problem with that is that the sound appears as if its inside the block, about three cylinders back. The first time my father listened, he used a makeshift stethoscope and heard the sound from the head. I have yet to stop by to have him give a listen since the head gasket repair though. The 7M engines in general have a tendency to blow head gaskets and develop rod knock, but there is a distinct difference between the sound of rod knock and this mysterious knock in the 7M. I know this because my friends 7M-GTE just got a serious case of rod knock, it makes my knock seem like it supposed to be that way. At any rate, keep us updated and I will as well. Good luck. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's" Last edited by Chambers; 12-14-2008 at 02:59 AM.

12-14-2008, 11:44 PM	#9
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	Well I guess its a question of time and who, then we may decipher what this knock is by that someone re-building there engine. lol. Hate to have it that way but thats the way its looking to be, but hey, as long as it still runs why complain. Good luck. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

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12-13-2008, 11:26 PM	#2
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	do you hear it at idle? Does it sound more like a double knock or is the speed of it consistent? You could also have valve noise. Theres really a lot of things that can make knocking noise including a cracked flexplate etc..

12-14-2008, 01:24 AM	#3
supraduper Stock Join Date: Dec 2008 Location: nh Posts: 14	noise is not at idle... runs smooth, aside from the oem wires, which make it skip a lil... noise is heard when cruising at a steady speed, with the rpms above 2k... again light throttle crusing speed, its like a rattling sound.... if i gas on it gets a little louder and subsides shortly untill i get above 3k. then it gets more rapid the higher the rpms.... it does have the sound of a wrist pin, as in its maybe a double knock... but i hadnt heard of anything like that with these engines, just the crank bearings.... is this possible to have a bad wrist pin with 117k on the motor??

12-14-2008, 01:28 AM	#4
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	Anything is possible. Get a mechanical oil pressure tester gauge and check your oil pressure.(not the stock one)

12-14-2008, 01:46 AM	#5
supraduper Stock Join Date: Dec 2008 Location: nh Posts: 14	i have one... im a mechanic... so i have an idea what im listening to... but i come from honda world.... this is my first toyota..... and what a f'n ride.... so much torque... its more like an american muscle car than an import but yea.... oil pressure is good... at least its not super low i was trolling craigslist and it seems that most of them on there have engine noises in the lower end.... can they not take the abuse?

12-14-2008, 01:53 AM	#6
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	The 7mge should last you many many miles, just depends on how it was previously maintained. Use a stethoscope to further narrow what the noise is. As i said it could be a multitude of things... Its not like the 7mge has a tendency to do any one thing. How it was treated in the past dictates what has happened now, there's nothing else to really say.

12-14-2008, 05:22 AM	#8
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	my 7mge also has a mysterious knock noise, but only at idle. I have taken it to the autocross course, and i abuse it every day and it hasn't really gotten worse, so i cant say i really know what it is. I suspected wrist pin as well but it isnt a double knock and my car is too low to use a stethoscope, and i have no access to a lift.

12-15-2008, 01:24 AM	#10
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	pretend it isnt making noise and you will be stress free