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?

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..

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??

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

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?

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.

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.

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.

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.

pretend it isnt making noise and you will be stress free;)

not sure what your stying to say. the wording was kind of weird...

but from what i gather, your implication is that maybe the knock is due to the fact that i replaced my own head gasket.... im not inclined to think thats the case... as i asked the kid i bought it from if it had a noise before the head gasket blew, he said yes..

but dont get me wrong, i may be a mechanic but i definitely did a sub par job when doing the work... as i rushed it and just was stupid.... i cleaned the gasket area on the block with rags in the cylinders and all that good stuff but when i removed the rags there was some debris in the cyl walls and some fell down to the piston ring area... i didnt have any compressed air, so i threw it back together, knowing what the consequence could be... and now it burns oil.... im pretty sure i smoked the rings..

but in truth im ok with that, as i bought the car for 400 and didnt want to perform a full rebuild without knowing what kinda of condition the engine is in... so i figured i was going to re-ring and replace the bearings at a later time if the engine was good...but if this noise really is a rod knock then that would likely make it more reasonable to buy a new engine and swap it out.... and surely it would be a bonus to go to a turbo engine

Na, what I mean is that it may just be a matter of time before one of our engines finally go, Then we may find out what that knock is by some one taking their engine apart. I have no reason to put you down, and if it seemed like I did then I apologize. This past October was my first head gasket, I had no special tools or air to blow all the crud out of the cylinders as well, I just cleaned it as best as I could. Not trying to offend anyone, sorry bout that.

no worries, like i said i wasnt sure what you were trying to say.... haha

GOD!!!! YOUR SUCH AN ASSHOLE!! j/k


well eventually i am either going to buy a new engine... or attempt to rebuild this one.... i like the idea of a 300 hp N/A. although, that might not be feasable as i know that the bmw inline 6 thats in the m roadsters has a 3.2 L engine with constantly variable valve timing and its pushing out 315 hp and 251 ft lb or torque... so i dont think 300 is a reasonable goal as i wouldnt be able to get the ideal valve timing (of course without losing power elsewhere)

i wanted to stay away from turbo, as i hear they often need servicing... any truth to this?>

There is truth to that if you start out with a crappy, abused engine, and abuse it more. If you start with a well built fresh engine running decent boost you are not going to have problems. It is when people try to get big numbers and abuse the engine constantly that they get problems. Though i abuse the hell out of my NA even with this knocking sound and its still holding up.

probably rod knock. Keep the oil full and keep an ear out for it getting worse. Don't want to destroy your block.

yea, well i got an opinion from some of my toyota friends at the dealership and they all agreed its a rod knock... as evident by depressing the dashpot so that the throttle chokes out... then the sound was clear....

so my next question... im pretty familiar with rebuilding engines.... however i dont want to pull the engine... i was wondering, is it possible to do an in-chassis rebuild? just pull the timing belt, head, lower crossmember, and oil pan. is this possible?

i imagine the rod knock can be cured with new bearings??? is this correct?

Well, there is a lot to do when it comes to dropping the cross member, I haven't done it but I have seen a write up on another forum about it. It would be much easer to pull the engine out unless your hell bent on doing it in car. As long as the crank and the connecting rod journals are ok, then new bearings will be good.

Good luck.