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Message started by TheSneeze on 03/29/23 at 14:20:20

Title: When you trust a new engine shop
Post by TheSneeze on 03/29/23 at 14:20:20

Okay, this is not two wheel related, but it does apply to anyone who plays with motorized vehicles and pulls their own engines. The following pictures are from a borescope on a 2.5L Subaru engine I just had rebuilt by a shop that specializes in Subarus. It's all they work on, and they have their own machine shop. The engine has less than 500 miles on it, and I changed the oil and filter for the first time. I kept it under 4k rpm, and babied it the entire time. I paid for the engine block to be bored and honed. For the long block rebuild, I felt I paid a premium, actually. But I told myself these are specialists, they know what they are doing.

1) where is the cross hatching from the honing? Very little is visible.

2) why are circumferential boring lines still visible? These grooves are parallel to the rings. Not what you want.

3) vertical scoring/scratching already visible

4) metal particulates visible in the drain pan after emptying it. Cut open the filter, even more captured in the filter element.

Title: Re: When you trust a new engine shop
Post by TheSneeze on 03/29/23 at 14:20:38

another

Title: Re: When you trust a new engine shop
Post by TheSneeze on 03/29/23 at 14:21:09

a gouge/galling?

Title: Re: When you trust a new engine shop
Post by justin_o_guy2 on 03/29/23 at 15:59:23

It should be shoved up the owners butt.

Title: Re: When you trust a new engine shop
Post by Ruttly on 03/29/23 at 20:22:31

That sucks , I would want to open it up for a closer inspection
And be making a list with corresponding pictures in case you got to go to court. But the more stuff you document then builder knows he’s got to make it right.

Trust no one , especially me

Title: Re: When you trust a new engine shop
Post by TheSneeze on 03/29/23 at 22:21:13

The shop owner's response was to continue to drive it. It is normal for the oil loss (I get that part), and the metal particulates during break in (this part I don't get). He claims that on my next oil change the loss of oil and metal particulates will go away. Also they have a 2 year warranty on the long block. Coming from a career in running a cnc metal fab shop, I am a bit skeptical. Once surface metal starts to come off it very rarely gets better as it wears in. It almost always gets worse, much worse. But, with a 2 year warranty, what the heck. Double the break in miles, and see where it goes. I had to cancel a 3 day overland trip in Death Valley due to lack of confidence. Better safe than sorry. Send it! More break in miles of the local nature and we will see where this adventure goes. I just don't trust the look of those cylinder walls.

Title: Re: When you trust a new engine shop
Post by TheSneeze on 03/29/23 at 22:23:34

I should note that a compression test today showed that the readings are within 9 psi, ranging from 149 to 158 psi. Consistency is the most important, but those are good, high numbers as well. Fingers crossed.