DIY Subaru Shortblock Rebuild - EJ25

In this episode, Aaron and Nate rebuild an ej25 subaru engine in the garage!

Music cred:
Odd Chap - People & Places

[Captaindan]

Impact screwdrivers that you hit with a hammer are perfect for those screws on the back piston pin access hole.

[MrJayRetrogaming]

I just got 2002 Impreza outback sport 2.5 together, I used a 2005 Forester short block I just change the pistons to match my head, I just want to say thanks, your videos encourage me get it all done.

[markcozzie]

I'm curious how long this build lasted??, those pistons looked lose?
I watch Subi-performance and he sure builds them differently, doesn't use all that sealant

[Blingstarr]

The sight of you using a hammer instead of a dead blow to seat the case halves made me cringe.

[ofivenojoe]

You need to go thru without bell mouthing, so you can avoid barreling the center, you want around 45 degrees
This is for oil retension to help break the rings in.
You can order ten over rings so you can set your own end gap instead of what they send, I normally go four thousand per inch of bore, and those oil control rings can be easily cut to fit, they tend to stay close to the same size, their job is not to seal, but provide oil and cooling, keep on, it will run great!

[joshuacampbell]

how did this engine hold up? can we get an update?

[ajl]

I have a spare EJ253 from a '99 Forester that I'm about to rebuild. Thanks for this upload!
P.S. also going to use your turbo DIY for my 2000 RS coupe!

[oleksandrkozyr]

Oh yes, to remove those philips screws use punch similar size to the head of the screw and punch pretty hard with small hammer. Sometimes takes few tries. They come out easy then with normal screwdriver

[evanbassett]

Impact driver is the only way to get the phillips screws out intact. You would have that cover off in under a minute. Pry from the top through the sensor hole.

[SimpliCharts]

A video outlining the steps on how to properly measure bearing clearance would be very useful! Also, at the step of removing screws for the plate, a punch screwdriver is the tool used to remove it.

[oscarp]

Why would you reuse pistons, and connecting rods?? Shady tree mechanics at its best!

[flyboynextdoor]

Always like the channel but finally something Specific I can Use! Don't like the dingle berry hone though, prefer the stone tripod myself 200-220 grit for 5 mins.

[tonyrichmond]

wire welding in flip flobs. HUGE stones on this guy, lol. I had a couple chunks burn through my shoes once...

[Baker]

How much should I budget for a rebuild like this I plan on getting a junkyard motor and freshing it up my self before I put it in my vw bug

[matthewbolton]

its most likelly thr heat from the weld breaking them oil cover screws loose

[groomlake]

Great vid guys seems like your very competent but it’s time to buy some inspection tools. A dial bore gauge and some mics will go a long way!! When dealing with piston rings you must understand how critical it is!!! When dealing with rings .0001 matter and yes I mean tentohousends!! When picking rings for a application is very important to look at the rings specs you need vertical clearance with the ring and the groove to let the combustion pressure get above and behind the ring to seal the bore. .0002-.0003 can make or break you!! I’m forced induction the trend is to go to a super low radial tension ring and let the gasports seal them when there’s positive pressure over the crown of the piston and dry sump and vacuum pumps to seal them when there’s negative pressure. All manufactures with hold there product to a slight different size . This is why in the Performance piston business I have To know what rings are being used before I can engineer and plan the costumers pistons to manufacture . There’s also a ring called a .017dikes or .043dikes top and second ring . They are the go 2 ring in any super or turbo charged high power application only down side is the piston has to be machined to except the ring. Next time you are trying to clean carbon if pistons try baking soda works great for combustion chambers exhaust ports and intakes that see EGR

[nitrosmurph]

Ok for my Subaru motor heads . Question... I was re assembleing my connecting rods and everything went pretty smooth . My one concern is one of the connecting rod bearings seams alot more stiff (tight) . I took it apart and put it back together a few times checking everything . These is no scoreing and it seams clean . It still moves but it seams to have about 7 pounds of resistance . The other ones just flop arou d with eze .... It's not scrapeing and it moves really well just with more pressure . Is this ok ? . I don't get it . Everything was seated correct as well I looked a few times . I did use a siginificant amount of assembly lube I'm wondering if that can be a part of it ??? !!! I don't want a spun hearing right away I'll be pretty upset !! Picture below is the old spun bearing . I got a donor motor with low miles and used the crank and rods . I also got a kit all new bearings and rings and seals ect :)!

[suttencheeny]

Please invest in a rubbet mallett, was so painful to watch. Still great vid keep it up ☺

[midnightdrives]

its going to be fun rebuilding my ej25d.

[pcrb]

I can only imagine that the purpose of this video was for people who already know how to rebuild an engine to watch someone else go through a procedure they are already familiar with.

No explanation as to what you're doing, what you're spraying the various parts with, what you have checked out on the engine. Many steps of the re-assembly were left out.

I assume that if you're going through the trouble of installing parts to the block, you have checked the cylinders and housing for cracks, scratches, out-of-round and taper, and if you have sent the block to a machine shop for anything but we wouldn't know from watching this video.