What is this engine wear?

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Aug 12, 2019 | 10:13 PM

#11

05TurboS2K

Rock Crawling

Joined: Apr 2017

Posts: 467

Likes: 114

From: Redmond, WA

Quote:

Originally Posted by za105

Shoot, I wanted to check bearing wear while I was under there and took these pictures (and more) but didn’t know what I was looking at. This has all happened faster than I could do research and studying. Didn’t realize I had to pop off some rod caps to see the bearings... shoot. I had it off and back together all Saturday morning.

I assume it is bearing wear. 145k, 4.5 years of ownership and tried to maintain it like a princess.

Also, 05Turbo, I believe the thicker oil will only make it harder to crank on start, and reduce fuel economy, but because bearing wear results in increased clearances, which is bad, the thickness helps reduce the clearance again, which is good. This is if my understanding of what I’ve crammed in on engine reading this weekend is at all correct, but I might have misunderstood.

True it'll take up some slop in some places but that has it's limitations because it means anywhere else the engine doesn't have extended wear, while experiencing pressure isn't experiencing the volume it should. A good example is motors with oil squirters under the piston that are there to cool the piston, that's a spot where thick oil can lead to a lack of volume and cooling ability and thus..... problems. It's a balancing act like all things I suppose but I like to play devils advocate in these scenarios to keep myself from pretending things are better than they are ha!. I think you'll be fine but it sounds like you're on your way to needing to plan for a tear down or replacement at some point.

Aug 13, 2019 | 05:17 AM

#12

Extinct

Baja

Joined: Feb 2013

Posts: 5,269

Likes: 1,809

From: Lynchburg VA

Outside of subzero operation there is no instance where lower viscosity oil is better for the engine, it is only better for hp and fuel economy. That is why diesel engines (designed for high mileage) all have high viscosity recommendations. The viscosity recommendations are all about the OEM being able to put another 5 hp and another 1-2 mpg on the window sticker. They could give two ****s about your engine life past 100k.