I had my timing belt, water pump, idlers, tensioner, thermostat (first time replaced), cam seals, crank seal and the two cam gears replaced on
my 1998 LS400. All Toyota parts from Lexus dealership. Everything put back together and when mechanic started it up,
I heard this knocking and I thought I was gonna pass out. My 20 year old friend was making a lot of noise. Mechanic said
he was stumped. He had gone through everything twice. The engine is not missing. It was not and had not ever made
this noise in 20 years. It didn't use oil per se but the cam gears were leaking and making a mess in my driveway.
My Lexus contact (not mechanic, just a great friend) said the make sure the bolts go back through the holes on the cam
gears to make sure the cam shaft still had tension on them ???. He said to check compression and look inside the cylinders and
see if something had accidentally fallen in. Since the intake was not removed, that was a long shot but something may have
gotten sucked in through the throttle body.
Bore scope showed nothing in the cylinders. Compression was fine. Timing marks line up perfectly. The first time he tried to
get the 10 mm bolt to go through the hole in the passenger side cam gear it didn't go in but 1/2 inch. Subsequently attempts
while rotating engine 180 degrees then allowed the bolt to go through the passenger side.
My mechanic and Lexus contact (with engine specialist) are talking and scratching their heads. If I have to, I will tow it to Trav's
house. Anyways, I'm open to any idea or suggestion.
When I figure out how to post a video, I'll have it for you so you can hear the knock.
my 1998 LS400. All Toyota parts from Lexus dealership. Everything put back together and when mechanic started it up,
I heard this knocking and I thought I was gonna pass out. My 20 year old friend was making a lot of noise. Mechanic said
he was stumped. He had gone through everything twice. The engine is not missing. It was not and had not ever made
this noise in 20 years. It didn't use oil per se but the cam gears were leaking and making a mess in my driveway.
My Lexus contact (not mechanic, just a great friend) said the make sure the bolts go back through the holes on the cam
gears to make sure the cam shaft still had tension on them ???. He said to check compression and look inside the cylinders and
see if something had accidentally fallen in. Since the intake was not removed, that was a long shot but something may have
gotten sucked in through the throttle body.
Bore scope showed nothing in the cylinders. Compression was fine. Timing marks line up perfectly. The first time he tried to
get the 10 mm bolt to go through the hole in the passenger side cam gear it didn't go in but 1/2 inch. Subsequently attempts
while rotating engine 180 degrees then allowed the bolt to go through the passenger side.
My mechanic and Lexus contact (with engine specialist) are talking and scratching their heads. If I have to, I will tow it to Trav's
house. Anyways, I'm open to any idea or suggestion.
When I figure out how to post a video, I'll have it for you so you can hear the knock.