Hi all,
I've been living with this noise since I swapped the 7M into my 1986 4Runner. Everyone that I've talked to either has no clue, or is under the impression that it's not a big deal. I bought the motor with the impression that it had been rebuilt. If it was, I'm assuming that it wasn't done well. I feel stupid for buying a motor without listening/testing it, but hindsight is 20/20.
The noise was present with the 4Runner's original transmission/driveline at the beginning of the swap, and was also present with a brand new transmission/clutch/differential/drive shaft package. I then did the valve clearances, hoping that it would solve the problem. Even after checking and re-checking the clearances to ensure that they were correct, the noise persists.
I have used a stethoscope, but I'm really unsure what I'm listening for. I've heard a rod knock from a few different motors, none of which were of Toyota manufacture... This doesn't sound similar to what I've heard.
I haven't observed any negative symptoms --that I'm aware of that is. I'm sure some of the more seasoned Supra mechanics would say otherwise--, power is good, idle is good, fuel economy is good..
I took some recordings while I was driving. I hope this helps. I'm after the clacking noise. What confuses me is how it pulses. I think it's evident in the second video. It's always present, but gets louder with the RPM's... up until I'm going interstate speeds. Then, a mixture of road noise/wind and sustained RPM's above 2300 and the noise seems to disappear.
Noise on idle : [video=youtube;dQ_f7EEiyn0]http://www.youtube.com/watch?v=dQ_f7EEiyn0&feature=youtube_gdata_player[/video]
Shifting through the gears... [video=youtube;6nkYsb9BSaA]http://www.youtube.com/watch?v=6nkYsb9BSaA&feature=youtube_gdata_player[/video]
More driving :[video=youtube;DZyXu9ep22Q]http://www.youtube.com/watch?v=DZyXu9ep22Q&feature=youtube_gdata_player[/video]
There has been a small voice in my head telling me that a rebuild is necessary. Is this a correct assumption?
Any advice would be appreciated.
Thanks,
Greg
I've been living with this noise since I swapped the 7M into my 1986 4Runner. Everyone that I've talked to either has no clue, or is under the impression that it's not a big deal. I bought the motor with the impression that it had been rebuilt. If it was, I'm assuming that it wasn't done well. I feel stupid for buying a motor without listening/testing it, but hindsight is 20/20.
The noise was present with the 4Runner's original transmission/driveline at the beginning of the swap, and was also present with a brand new transmission/clutch/differential/drive shaft package. I then did the valve clearances, hoping that it would solve the problem. Even after checking and re-checking the clearances to ensure that they were correct, the noise persists.
I have used a stethoscope, but I'm really unsure what I'm listening for. I've heard a rod knock from a few different motors, none of which were of Toyota manufacture... This doesn't sound similar to what I've heard.
I haven't observed any negative symptoms --that I'm aware of that is. I'm sure some of the more seasoned Supra mechanics would say otherwise--, power is good, idle is good, fuel economy is good..
I took some recordings while I was driving. I hope this helps. I'm after the clacking noise. What confuses me is how it pulses. I think it's evident in the second video. It's always present, but gets louder with the RPM's... up until I'm going interstate speeds. Then, a mixture of road noise/wind and sustained RPM's above 2300 and the noise seems to disappear.
Noise on idle : [video=youtube;dQ_f7EEiyn0]http://www.youtube.com/watch?v=dQ_f7EEiyn0&feature=youtube_gdata_player[/video]
Shifting through the gears... [video=youtube;6nkYsb9BSaA]http://www.youtube.com/watch?v=6nkYsb9BSaA&feature=youtube_gdata_player[/video]
More driving :[video=youtube;DZyXu9ep22Q]http://www.youtube.com/watch?v=DZyXu9ep22Q&feature=youtube_gdata_player[/video]
There has been a small voice in my head telling me that a rebuild is necessary. Is this a correct assumption?
Any advice would be appreciated.
Thanks,
Greg