One bolt broken, one fully loose but won't come out, and the pump housing itself absolutely refuses to come out.  I can twist it slightly back and forth, but have made not even 1mm of progress getting it to come off.

 

 

I'm trying to get this engine disassembled so it can go to the machine shop to be reconditioned, and I'm tempted to just have them remove the pump by any means necessary and replace it.

Try splitting the cover off of the pump body, 5 and 1.  That's probably where the stuck bolt is stuck.

Try soaking the stubborn and broken bolt with Kano Kroil. And I mean really soak them and let them sit for a couple of days. After that, try heating up the area around the bolts with a propane torch (go easy here), and just keep working to remove. The bolts are surrounded with oxidation.

Edited March 19, 20222 yr by crayZlair
added text for clarity

10 minutes ago, Zed Head said:

Try splitting the cover off of the pump body, 5 and 1.  That's probably where the stuck bolt is stuck.

 

Thanks, though the problem there is is looks like one of the 2 bolts that holds the two halves together is inaccessible when it's mounted on the engine.  Unless I'm misinterpreting what I'm seeing...

Edited March 19, 20222 yr by ArcticFoxCJ

Just now, crayZlair said:

Try soaking the stubborn and broken bolt with Kano Kroil. And I mean really soak them and let them sit for a couple of days. After that, try heating up the area around the bolts with a propane torch, and just keep working to remove. The bolts are surrounded with oxidation.

I'll give that a shot.  To be honest, with the massive sludge and slime that was in the oil pan, I'm not entirely sure this pump is even viable...  But I'd rather not replace it if I can avoid it.  

Been there, done that. Oil pumps are cheap. Front covers are not.

There's no way you want to put a used oil pump of questionable integrity on your newly reconditioned engine.

Sawzall is your friend.

But integrity is undefined until it's off and disassembled.  The dilemma.

Funny, I saw the cartoon and thought the right words to search to be sure, (Edit, deleted stuff - never mind.  I see that the caption fits what he said.  Oh well.)

Would Heisenberg be more appropriate?  Not the Breaking Bad one.

Edited March 20, 20222 yr by Zed Head

10 hours ago, Zed Head said:

Would Heisenberg be more appropriate? 

Only if we knew how fast he was removing the oil pump.

I used the Melling 152 turbo manual transmission oil pump on mine. It stays on the high side of the gauge. Seems like it was $60 in 2016 from Advance Auto. Probably a $100 now. 

Found on google.com...

non turbo L28 (75 to 83)
model M90 = 2 gallons/minute at 491 rpm

turbo L28 with automatic trans
model M111 = 2 gallons/minute at 491 rpm

turbo L28 with manual trans
model M152 = 2.25 gallons/minute at 491 rpm

I used Melling as well because I liked the cast iron body instead of aluminum. But if you don't care about that, you can get an original Hitachi style (aluminum body) version from Rockauto for less than thirty-five bucks.