Well there is no telling how the owners before me maintained it the 120k before me owning it. The 6-7k miles I put on it had multiple oil changes. But there is no telling, defiantly will be putting new ones in. I will think on it if I want to try and knock it loose from the cam.

 

 

Depending on which bearing it is, it might be the one that’s seated from the rear of the block.

 

So that cam bearing spun in the housing? Could that cause damage to the housing/block? Make sure you tell your machine shop.

I tried to fix an LQ9 with a spun front main bearing on the crankshaft. Machine shop said block was not salvageable. The cam and cam bearings were still good though. I measured the cam journals and all were within specifications. I did not measure the cam bearings though, but assumed they were okay. They looked okay on a visual inspection.

I do recall reading somewhere someone saying it was something that does happen, but can't attest to that. My daily driver LQ4 has 252k, and lots of work trucks are out there with 300k miles+. So maybe it had to do with maintenance and/or material supplier QA/QC?

Doesn't the cam bearings get oil right before the main bearings on these engines?

 

Its the second from the front journal so I cant take it out the back. I called my shop this AM, they said either they beat it off the cam or I do. That is only way to get it loose, then use something to cut it apart once loose. They said they have seen it more often than not on an ls. But like yall have mentioned will need to measure to make sure its in spec. I wonder if this will work since its the second one, the front bearing is easily accessible to knock out. Get that one out and cut, then the second one which is seized will slid out since it was hitting on the front bearing. Use like a small punch to knock it loose. Seems easier than trying to loosen the second one in the back. Going to replace all of them anyways.

 

Well decided even if I got cam out clean, that I will not run it again. If it got that hot then it damaged the heat treat and coating. I will be in same situation. So I snaked a Dremel up and cut the bearing in half. Looking at the bearing it’s horrible and the darker cam lob doesn’t have a smooth finish anymore. What a sh@t salad

 

I was going to suggest getting a new cam but I didn't think you'd wanna do that lol

 

I mean I dont want to haha, but putting this one back in is a ticking bomb. I called TSP where I got this cam back in 2015, back then I bought it from them but it came in a comp cam box. Now they grind their own cams, they said 385 dollars they can get me a cam that will perform better than this one. So win win I guess.

 

I wouldn't run it either... Not worth the risk.

It's not so much that it may have ruined the heat treating but if the cam is warped from the excessive heat, then you will be right back in the same boat...

 

Still in parts gather mode got about half of them. Need some opinions, are the ATI dampers worth their money compared to stock? I am sure the answer is yes, but would stock lsa balancer get the job done just as good. Also I have true duals at 2.5 inch size pipe, will that be enough flow for a 6.0 lsa? HP goal at the end of this is 500-600.