Stripped Engine Screws ¯\_(ツ)_/¯

As I'm sure its a pretty common problem. My Screws are stripped and/or won't budge. Does any one have any tips or tricks for removing these with out damaging the cover and/or would any one care to share any threads on this topic. i couldn't seem to find the answers i wanted.

Do the "easy out" screw extractors work well?

Wheres the best place to get replacement KZ screws?

I've always been able to get them out by using a hammer driven impact screwdriver.
When you get them out.... throw them all away and never be tempted to use JIS screws again...
GET stainless steel ALLEN heads!!

+1 on the impact driver. JIS screws are fine as long as you use the proper tool. There is a very recent thread about them. If some are broken off, use te impact driver , preferably with the proper JIS bit, to get the rest out. If you can then remove the cover, you might be able to grab the stubs with vice grip pliers and turn them out. Heavy, repeated soaking with Kroil or some such, may help.
Some pics may help bring good advice for particularly problematic ones.

Easy outs can cause bigger problems than you already have. I'd recommend avoiding them.

Yup.
Steve

Yea, you need an impact driver. No way to remove the case screws without one. However if in fact the screws are rusted into their holes, don't use a screw extractor, as they are useless junk. All you will do is break the extractor in the screw, then you're screwed big time because it can't be drilled out.

Yeah, I've had to pound on them to loosen them enough to extract them with a magnet. Waste of a lot of time and had to drill out the screw and use inserts anyway.
Steve

Try heating the screw head with a butane torch, which will heat both the steel screw and the female aluminum threads, whereby the aluminum expands more than the steel to hopefully relax the grip between the threads.

Use an impact wrench while the parts remain piping hot.
A hand impact wrench should work okay.
If available, an air powered impact wrench might also help.

When replacing the screws, would consider first applying some anti-seize compound to the screw threads.

Good Fortune!

A hand impact is a must for every tool box.
Stewve

Get a good one, you will have it for the rest of your life!

TexasKZ wrote: ...impact driver , preferably with the proper JIS bit....

Should be able to modify the Philips head bit that's usually included with the impact driver kit so that the bit will better match the JIS screw heads.

650ed has a good thread on how to modify and convert the Philips head bit into a JIS bit.

Good Fortune!

BEFORE you try to remove the stuck screws do yourself a huge favor and soak them with Kroil for 3 days. This stuff breaks the corrosive bond between the threads and makes it much, much easier to remove the fasteners. I have used it on several different fasteners that had been in place for more than 30 years and they always came out without a struggle (and in fact without an impact driver even though I have one). You may not want to wait until you get Kroil, but wait anyway. Otherwise you may spend much more time trying to repair damage that you cause by fighting with the screws. It really does work!!!

Use a JIS screwdriver bit on any crossheads screws. Those screws look like Phillips, but they are NOT Phillips, and trying to remove them with a Phillips screwdriver will create a problem. Just ASK if you need further info on JIS screwdriver bits.

Kroil can be ordered online or some good gunshops carry it. Here's more info on it:

www.kzrider.com/forum/4-electrical/59672...k-need-advice#656244

Impact driver. heat. vibration. penetrant. time.

For the stripped heads you might be able to cut slots into them using a dremel, then use an impact driver. A penetrant might help --- give it time to work --- overnight or longer. Kroil is supposed to be best. Liquid wrench penetrating spray lubricant is good, readily available, & cheap. pb blaster didn't do as good in a test floating around the internet.

When using heat, you have to be mindful of any wiring n stuff nearby.
Vibration: you can use a wood block & mallet to help loosen the threads --- spray the penetrant first, then tap tap tap the screws. Let it sit a while, then do it again. Next day, same thing. Then use the impact driver.