Heart Transplant at 278,000 miles

Only takes one good triangle of death to damage the motor. Triangle means zero oil pressure detected.
Your pumping air instead of oil.

Toughest little motor ever but can’t tolerate low oil.

As the resident fleet manager at my house I pay special attention to the wife’s car. Only because I dread that phone call.
And maintaining oil level is really easy. Just do it every saturday morning on all cars before you start them. If I see oil loss I increase that check period. It has paid off my 130000 mile g2 bought new on 07 does not use oil. It had a small oil use but I moved up to 40 weight oil and that stopped that in its tracks.

 

Pretty minty top end. Its seen alot of oil changes with good oil. Well worth fixin' the bottom end. See how bad the cylinders are the cams look pretty good. Good job.

Fear the red triangle man lol.....

 

You fill the cylinder with rope, so piston can't come up, engine can't turn. I think I've heard of that.

 

I think the piston has thrown out a lifeline!
{Lassie, run get Paw!}

 

Hi SnT08Prius,
Thank you very much for documenting your engine disassembly for us!

Did you happen to notice if there was much looseness of the timing chain?

Did you happen to notice if there was still some travel left in the chain tensioner?

Are the timing chain guides worn more than 1 mm?

Is there any obvious excessive wear of the camshaft bearings, cam lobes, or valve tappets?

Your engine condition is particularly interesting to me, because my Prius, with 265,000 miles, will soon have as many miles as yours.

 

did you check compresson prior to pulling the head?
.

 

Talk to a machine shop? There's gotta be a way.

Eric the Car Guy has one video on broken bolt removal, drilling it out, slowly escelating drill diameters.

 

Nice work.

I have had good luck with scary bolts using an impact gun. You can rent a half inch for $10 a day.
Just bump it in reverse don’t go full power. Just sit there gently bumping it in reverse. The constant reverse bumping impact Will eventually loosen it with no drama. Takes patience but works. If there really stuck on I freeze the bolt Using freeze spray And that will shrink it. You roll up a piece of paper in a tube put it around the
Bolt head and freeze it. Wait a while and freeze it again and back to bumping. Freeze spray is used by electronic bench techs to troubleshoot thermal issues.

Friend at work last week stripped out 55 mm torx head bolt on a ford 4.0 six cylinder. What a pos that motor is. He ground a line in the stripped bolt head not sure why your not going to get that out with a flat blade screwdriver. Only way out is easy out or weld something to it.

Head bolts are a bitch there on there with 100 lbs torque. You get one shot at them.

Good luck.

 

iirc - crossing the 300K mile mark is where you lose the odometer.
Congratulations!
.

 

I would try the drill method myself. You already enlarged the opening, all you really need to do is take off enough of the bolt head to break it off. Use one of the other head bolts as a guide. Once you have the bolt head off you can slide the head up and off, just as if the car had studs instead of bolts.

 

I'd try @edthefox5 impact method first, unless it's hopelessly rounded. What about bolt extractors too, the left-hand screw bits? Leave the drill-out method for last