Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [rebuild]

Rebuilding parts and/or vehicles.

Rebuilding parts and/or vehicles.

54 questions
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5 answers

What should always be replaced when rebuilding an engine?

If the purpose of the rebuild is to bring the engine back (or as close as feasibly possible) to its original performance, what are some things that should always be replaced? This obviously depends on the condition of the engine, so let's say a…
tgun926
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How to Remove Core Plugs? (aka Freeze Plugs)

I have been removing core plugs from an engine I'm rebuilding with varying levels of violence. The engine block is aluminium and I'd like to reduce the chance of of me damaging it. How do I remove plugs while minimising the risk of damaging the…
Sam
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9
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1 answer

Do I risk damaging the valve seat if I lap this valve without removing carbon build-up?

This valve is from my LS1 (Exhaust #3). It's suffered from a lot of carbon build-up due to a history of fueling/spark problems. I've tried cooking it in ethylene glycol. I've tried using abrasion with a drill-mounted brass wheel brush, and it hasn't…
Zaid
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9
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3 answers

Should I replace piston rings on chevy 350?

I recently acquired a chevy 350 manufactured in 2015 for free because of some crank issues. I'm in the process of rebuilding it and have finished the disassembly of the engine. The engine itself only has 200 miles on it would it be necessary to…
CyrodiilSavior
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8
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3 answers

How do I properly break in an engine after a rebuild

I just changed my engine's piston rings and do not know how long I should let the engine break in. The engine is an '06 Chevrolet 1.5L SOHC. And how is the procedure done just by letting it sit idly?
method
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6
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1 answer

This valve is pitted - what options do I have?

This is that infamous Exhaust Valve #3 after cleanup. The cylinder had a history of fuel/spark-related misfires. As the images show, the lip of the valve is pitted. Here is the back of the valve. I haven't cleaned the seat up yet but it doesn't…
Zaid
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6
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1 answer

Is this cylinder head junk?

There's a chunk of aluminum missing from the surface of my LS1 cylinder head. In the picture below it is located on the edge of the rusty looking cooling jacket port. Is this something to be concerned about? Is it repairable?
Zaid
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6
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How to store a just rebuild automatic transmission

I bought a BMW e39 with a bad transmission (ZF 5HP18). I bought another one in a junk yard and I plan to rebuild myself the one that came with the car and keep it as a spare. My question is: after I do the rebuild and put together the old…
Rafael SP
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6
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2 answers

Using a thicker head gasket when the cylinder head resurface limit is reached

I just bought a 2000 Civic 1.6L ( d16y8 ) with no compression in one cylinder. Four years ago, the engine overheated, and was completely rebuilt by the Honda dealership. One of the things on the invoice was "cylinder head resurfacing". Assuming…
Robert S. Barnes
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5
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What can be done about an underweight piston?

I am rebuilding a 6 cylinder BMW engine. The engine had 300,000KM on it. I want to balance the rotating assembly as I want to increase the RPM redline from 6500 to 7000. Upon measuring the pistons after completely cleaning, the below tables are the…
tgun926
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5
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2 answers

When to bore a block during a rebuild?

While reading this question about a motorcycle cylinder and piston, the question comes to mind basically for the same thing, only for an automobile engine. With this in mind, my questions are: When should you bore a block during a rebuild? How do…
Pᴀᴜʟsᴛᴇʀ2
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GM 4L60-E Rebuild Questions - Part 1

I am in the process of rebuilding my first 4L60-E (I've done a 4L30-E before) and I had a couple questions. 1st: In terms of the input drum pistons I know there are both aluminum and steel models, and that the new steel models need new return…
CyrodiilSavior
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How much should I replace in a motor swap? (Plymouth 440)

I am building a BigBlock Demon and have just bought the motor I plan to swap into it. It came from a '75 Dodge truck and is unmolested in terms of bores and modification. The motor was a '75 440 married to an auto 727, it had 38k original miles and…
user13227
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Light abrasion on the valve stems - is the outlook gloomy?

Background I'm rebuilding my LS1 Chevy. The cylinder heads came back from the machine shop fresh with a 5-angle valve job and mechanically-lapped valve faces and seats. What concerns me is the presence of some light chatter marks on the valve stems.…
Zaid
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4
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Viability of replacing engine 1996 Volvo?

I have a 1996 Volvo 850. It runs well, but the engine is 20 years old and I am concerned it may not last forever. The coolant is brownish, so I am afraid there might be a cross-contamination between the crankcase and the coolant channels. Also, some…
Cooter Davenport
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