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rand

Block deck surface

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I just pulled the head off of my new (to me) L24 that hasn't run in ~10 years to get it rebuilt and resurfaced yesterday, and my engine looks like it's in worse shape than I was hoping.  When I pulled the head off, there was coolant puddled in some of the cylinders.  I was hoping to just get the head work done, pop it back on and be able to drive the car around for a few months.  After cleaning up the deck surface a little bit, I've found that it's pretty scratched up and has a few nicks and dings around the top of the cylinder.  I was planning on pulling the block apart at some point so I can get it hot tanked, but now I'm worried that I need to get the deck resurfaced before I can run the engine.  Am I being too conservative here, or do I really need to pull this thing apart and get it re-machined?

 

Coolant in cylinders right after pulling head off:

IMG_5499.thumb.jpg.c5e7797ed10bd10f7e829de4f48f6435.jpg

 

Nicks and scratches on deck near cylinder: 

IMG_5523.thumb.jpg.a35f19fa1a4870111058c91bee1d06e3.jpg

 

More scratches:

IMG_5529.thumb.jpg.7d52e6f2a8d9da031c6f071e0466b0de.jpg

 

State of cylinder before minor clean up:

IMG_5507.thumb.jpg.f72c3462cda103eba9ef23326365f294.jpg

 

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From what's left under the hood, I would advise you to go all in with prep work. I've been there and I don't regret it at all. 

Looking at the shape of your block, hot tanked it is the way to go. Mine was in way better shape and had a lot of mud in coolant areas.

 

Surfacing the block is not very expensive. I've paid around 50 for it.

 

When it comes to cylinder walls, I don't see well but you should see some scratches. If you don't, you will have a least to hone them again. Check also for cylindricity. If they are out of shape, you also to move to bigger cylinder/rings.

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Thanks @Lazeum - that's the way I'm leaning.  My impatient side really wants drive this car asap, but I think I'll feel better if I clean everything up first. 

 

As long as I have this engine out I may as well strip and repaint the engine bay.  As long as I'm doing that I may as well strip and repaint the rest of the body. As long as I'm doing that, I should probably clean up and repaint the frame. As long as I'm doing that.... oh no, here we go!

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I'm with Lazeum you might as well have it surfaced and checked out while its out of the car.  It would really suck to put it back together only to have it blow the head gasket, burn coolant or burn copious quantities of oil.

Edited by rossman

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Ok, I'm all in. I wanted to rebuild this engine anyway, so I may as well do it now.  This is a project for me to learn and have fun with, and it's not like I need it to take me to work on Monday.

 

Speaking of learning, all of the guides I've seen to pulling the engine have you attach the engine hoist to the cylinder head.  Seeing as I've already removed the head, is there a recommended place on the block to attach to?  I'd rather not put my newly rebuild head onto the scummy block just to pull it off again.  Also, any thoughts on Tom Monroe's method of pulling the engine without the transmission?  I've heard that one is pretty controversial.

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Posted (edited)

Just wanted to follow up on my results on pulling the engine with the head off.  I ended screwing some bolts in into the head-bolt holes with some chain and washers on them.  It worked great and was pretty easy to do. Pictures attached.

 

 

IMG_5611.thumb.jpg.34165f1fcd20425cfaa963c1565d82d2.jpgIMG_5610.jpg936267189_IMG_5620(1).thumb.jpg.de2e3c6b3eadd0ee5c9440b5f8d9f904.jpg

 

 

IMG_5608.jpg

Edited by rand
Cleaning up images

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I've pulled pretty much everything off of the block now and am getting ready to bring it to a machine shop to get checked out and cleaned up.  I was looking at my timing cover, and the area underneath the water pump is pretty badly pitted and scarred looking.  Am I going to need a new timing cover, or is it fine to just run the engine with this one?  I don't mind replacing the water pump, but timing covers are pretty hard to find.  I saw a few on eBay, but they were around $250 😐

 

IMG_5711.thumb.jpg.17fba1616913a4e8342543253804bc86.jpgIMG_5715.thumb.jpg.42f10f8c80894fbd59e701aed610aed3.jpgIMG_5713.thumb.jpg.4964f35762ef4a9346ec95582073d175.jpg

IMG_5717.thumb.jpg.0a35105c24285771453f1a092d7594a1.jpgIMG_5718.thumb.jpg.18f5770d7aecfa4302ada74b4ae9c5a4.jpg

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I used one of those white roloc discs and just spent a ton of time cleaning all the surfaces.  Did top of pistons too.  This worked for my particular N42.  You'll need to vac out the dust as you do this.  Can't beat pulling it and having it professonally cleaned and machine decked though.  

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