I had the my engine rebuilt and am getting ready for final install. I ordered new knock sensors and was wondering if I should invest the money to replace other sensors like camshaft or crank sensor. This is a 01 RX with 87k, I just really don't want to have any more issues after I put it back together. Am I okay just testing and reusing old sensors or which ones should I consider installing new?

I have replaced about everything else you can think of with new parts, thermostat, knock sensors and the knock sensor wire harness, oil pick up......drained all trans fluid for full replacement along with trans filter and gasket, drained all transfer case fluid to replace with new, I figure if I have it tore down this far I don't want to have to take this engine out/or tear down for any reason ever again!!

 

Take a close look at the front transmission seal where the torque converter slides in. We didnt and my nieghbors highlander now has a leak on that seal. We were there, but assumed it would be good, but removing the torque converter and re inserting it gave us a leak, which we found after replacing the engine....Also did you replace the water hose on top of the intake manifold, the one near the knock sensors. You are there and is a opportune time to do so. good luck... as for the crank sensor etc, they are probably fine.

 

What a shame Thomas, that you didn't replace the front convertor seal. Especially since it's only a few bucks. When I ordered the rear crank seal, the parts guy suggested the convertor seal, and although it wasn't leaking, I really appreciated him mentioning it, as I wouldn't probably have thought of it otherwise. It was a pretty intense time.

 

Yep, did the front trans seal, thought of that because I definately do not want trans issue right after major engine overhaul. I did the hose too, I believe they call it a coolant bypass hose. Thanks to some advice after I posted in the "knock sensor" thread. Anything anyone else can think to check/replace?

 

What is a shame is that I mentioned to my neighbor the seal, and we didnt do it. Stroke of you talk about it and it went bad. I share the blame with my neigbor. Oh well, life goes on.

 

Well, it is what it is. I've been there before, usually trying to save a few bucks and time. It almost always costs you more of both LOL. What are your plans with it now? Leave it or pull engine again?

 

87K and rebuilt already? What happened?

 

I think he had a sludge problem,and threw a rod or something. (if I remember correctly) maybe it was a spun bearing,something to that affect.

 

Owned vehice 2200 miles. Sludge clogged oil pick up and starved engine for oil. Also upon rebuild found abnormal cylinder wear, probable cause major electrical problems. It appears to be knock sensors or ECU. The electrical problem is what probably caused the sludge in the first place because the engine was running at a higher temp than it should be. The engine was taken to diagnostic and the ignition was firing too often. Upon further research, getting service records from Lexus the vehicle was taken to Lexus @ 56k for overheating. They tested and couldn't find a problem so this was probably happening for awhile.......lame.

 

Good memory threw a rod......