Help, scratched cylinder wall

I have a 2014 Toyota Tacoma V6, bought from a guy with a knocking sound. Pulled the head off and found the cylinder wall scarred up on #1. Is there a fix? Can it be bored
Yes I can put my fingernails in the scratches

 

How much time and/or money do you have?

 

Welcome to TW, and sorry you are facing this problem.

I'm going to go out on a limb and proclaim that, while TW is a fantastic place, you are unlikely to get a definitive answer to your question. There are some experts here but most of us are hobbyists at best. You need a really knowledgeable expert here, because this is a big problem.

Go to your local machine shop. Ask the person there, someone who rebuilds engines, if they can fix this, and if so, how.

Ask them what you need to do. Probably you will have to pull the block yourself, and bring it in. This is a lot of work, but it would cost a ton for someone else to do it. You would probably need to rebuild other things too.

Keep asking questions until you either understand what is needed and how to proceed, or you don't want to fix the truck any more, or the machinist doesn't want to help you any more.

Good luck.

 

I believe rebuild parts are not as available as say, American motors, so yeah, it might be more difficult to get the work done
It’s likely a better idea to replace the motor with a junkyard pull, etc

 

I don't believe these can be over-bored due to the liners being pretty thin and cast directly into the block, there's a few people that have done sleeves but that's likely to cost far more than a good block.

@Torspd any insight?

 

I have seen some members here over bore their OEM cylinders. Due to minor cylinder wall damage. I know that LC Engineering has also done this specifically.

If a heavy hone cannot get that cleaned up, then an over bore may be necessary. Here's the tricky part. How much material will be left of the cylinder liner, to still be "safe"? I do not know what amount the OEM cylinder liner can be over bored.

If you have to over bore too much, then a replacement sleeve or sleeves will be necessary.

Darton Sleeves makes these. They can be purchased through a few vendors or directly.

Possibly here as well. https://briancrower.com/


You say a knocking sound. Was that due to the combustion problem, or due to bad crank/rod bearings?

 

@rheath08 was it you that did some over boring to your engine?

 

Those scratches almost look like either it was overheated or a ring came apart. There's no dings on the piston like a foreign object got ingested.

 

One of my engines had those scratches, from a low oil problem. Could be any of those things, until we get some more engine history.

 

Sorry for the delay.
That looks rough! I had my cats fail, it sucked in the dust and tuned the oil into lapping compound and my cylinder walls didn't look like that. I have bored the stock block twice now. it is currently .030"(.75mm) over stock.
Just find a decent shop. I have a few engine rebuilders in my town but they told me they will not touch a aluminum block or just said no. I think they only want to do old cast iron blocks for hotrods.

 

If they have to machine the heads or the deck the block, make sure you get all the specs that they machined. That way you can order the correct gasket thickness. Cometic has good options for thicknesses.

 

Like others have stated..... theres more to this story and we need to know details. Do you know engine history? A 1gr doesnt just scratch the cylinder walls out of the blue. Thats either from intake debris, low oil, or plain abuse.... at which point you may as well find a full replacement motor.

 

"Spiny'' cast in liners, better to find a good engine out of a wreck.

 

Thought the same thing. It can be bored out to .040" or 1mm. But find a good machinist. Like I stated in a earlier post, my stock block is bored .030" or .75mm over stock. When I looked for a " decent" used engine, it was $5k-$6k for an engine with minimum 130k miles and another about $800-1000 for extended warranty from a junk yard. I was not willing to risk that. I bought my truck used at 80k miles. It was piss poor engine maintenance performed. Once opened up you could see it. At this point for the engines it starts to become a risk. At least in my opinion.
This is not to argue, only to inform everyone of risk and options. This is coming from a technician for over 20+ years. I know rebuilding the engine is not for everyone, but information is power!

 

Welcome to TW..

 

@Dericklee33 if you decide to rebuild this yourself, I have O.E. thickness head gaskets you can have for the cost of shipping. I just rebuilt my motor and have some extras.