Holy crap, makes me wonder what shredded the belt too. Looks like one of the bearings seized?
I am cant believe how chewed up it got. Like it got shaved.All the bearings and water pump spin just fine. Think it was just a crappy belt. I literally ordered all the parts just 2 days ago to start this job next week, I can’t believe the odds of this happening right now.
Probably from being flapped around at 3000 RPM. The deposits on the idler pulley next to the tensioner looks like maybe it was picking up rubber. It may have come from bearing failure although you said all the pulleys spun freely. I also made the mistake of buying an AC Delco kit from Amazon in May of 2016 @ 108k miles. Only 65k miles later, by May of 2020, the pump started leaking a slow drip. I replaced the TB/WP/Pulleys with an Asin kit with the Mitsuboshi belt and Asin pump. Problem solved and hopefully it will be good for another 90-100k miles.I am cant believe how chewed up it got. Like it got shaved.
Total destruction of belt. Can’t say I can pinpoint cause just belt failure about 10k away from its lifespan which I suppose is about normal.
Admittedly it was the gates kit I used at 90k.
Years from now, when there are far fewer EJ25 engines still in service, someone somewhere will still ask us the question "can I save some money and not pay top dollar for OEM or Aisin TB kits?".All the bearings and water pump spin just fine. Think it was just a crappy belt.
Same thing happened on @cthies when using a gates kit?Years from now, when there are far fewer EJ25 engines still in service, someone somewhere will still ask us the question "can I save some money and not pay top dollar for OEM or Aisin TB kits?".
And we will point them to this photo and your statements of admission. This thread will become our Forum's poster child for clearly saying, with absolutely no other words needed, "stay far, far away from cheap Chinese TB kits".
And thus your loss will not have been in vain.
You deserve an upturn in your fortunes; best of luck on the repairs.
I don't know, do you really want to get into the bottom end on an engine with 172k on it?Looks like it’s running rich or oils getting past the rings. I am consuming about a qt every 1000 miles is this something I could look into while the engines out?
I'd say it's likely your smoking gun. How does the backpressure on it feel?Not a smoking gun by any means but a lot of seepage around hydraulic tensioner.
Yes, thanks for sharing pics of the tear down.View attachment 489096
View attachment 489097 View attachment 489098 View attachment 489099
Well got to the left side tonight, all four exhaust valves bent, not much hope for the right. Gasket looks pretty good for 172k. Looks like it’s running rich or oils getting past the rings. I am consuming about a qt every 1000 miles is this something I could look into while the engines out? Going to do the right side tomorrow.
Just for reference, I have A/B pictures of the parts from a 2016 TB replacement parts from an AC Delco Kit with the Gates water pump and timing belt vs. the 2020 TB replacement parts from the Asin kit with the Mitstuboshi belt in this post:And inquiring minds would like to see which manufacturer's mark is on that thing, can you see any?
@cardocGoing off price and further inspection I'm just going to go with all new valve seals and new valves to replace broken ones, no piston rings. Also for-going new 02 sensors for about 120 a piece. Things are starting to add up. Plus I have to now replace the blown out timing belt cover and to make matters worse my kid dropped the harmonic crankshaft pulley chipping off a piece, used on ebay for $30 bucks but still. Valve seats look good, I'll just lap all the valves while they're all out, leak down test showed a little seepage even for the good valves. Hopefully thats its. Any other recommendations?