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Engine Specific Info and Questions => IDI Engine => Topic started by: oblique on December 21, 2015, 01:29:58 pm

Title: cracked injector bore
Post by: oblique on December 21, 2015, 01:29:58 pm: I am stripping a used head I bought for cleaning and eventual use on my current block, which has oil appearing in the coolant.

I heated the head with a propane torch and used an impact to remove the injectors. There was a lot of corrosion between the injector threads and the head so I'm not sure if it cracked during removal or if I bought it like this.

(http://s7.postimg.org/kq25yq6vb/IMG_0369.jpg) (http://postimg.org/image/kq25yq6vb/)

(http://s7.postimg.org/ltmaaorif/IMG_0370.jpg) (http://postimg.org/image/ltmaaorif/)
Title: Re: cracked injector bore
Post by: ORCoaster on December 21, 2015, 04:10:56 pm: I think you might have done it using the impact wrench. Then again it might have been an existing condition. Really now way to know for sure. I had one like that at a shop told me he could lay a bead of weld on it and chase the threads clean and it would hold enough to get me by. I just went for the rebuild head routine. I figured why spend money fixing it if only temporary.

You have just purchased this and might want to repair instead. Keep us up on what you come up with.

I may have used the impact wrench to loosen them but would have done the some out then back in and then clean with air in between.
When it comes to those really corroded aluminum parts it is best to sort of wiggle the part out or do like cutting with a tap or die, some forward some back.

Sorry to see this either way.
Title: Re: cracked injector bore
Post by: thomas m on December 22, 2015, 08:46:08 am: Would using anti-seize compound on the threads have prevented this??????

Question: is there much difference, in this application, between using the "silver" or "copper" anti-sieze???

Thomas
Vancouver, WA
Title: Re: cracked injector bore
Post by: ORCoaster on December 22, 2015, 09:37:32 am: Anti sieze works well once you have them out and threads are cleaned. I use it on mine.

It doesn't help get them out the first time. That is what penetrating oil is for. Others use brake fluid, ATF or just some magic mix they have developed over the years.
Title: Re: cracked injector bore
Post by: oblique on December 22, 2015, 10:31:58 am: I will likely end up cleaning the area really well and have it welded. The crack winds down to the centre of the bottom of the bore projection, just above the glow plug bore.

I used PB blaster throughout but I think there was just too much corrosion. It came out in piles. The impact gun really had to work on a few of them.

Anyone know a good aluminum welder in the Toronto area?
Title: Re: cracked injector bore
Post by: libbydiesel on December 22, 2015, 03:26:40 pm: If you just spun them out all one direction then undoubtedly you broke it. You need to use the out a little, in a little, out a little more, in a little, etc method on injectors that have been in place for a long time. If you just spin them out one direction the crud balls up in the threads and cracks the boss.
Title: Re: cracked injector bore
Post by: ORCoaster on December 22, 2015, 05:08:53 pm: ;D ;D Listen and learn if you are just starting to take things apart. Breaking it just costs money, and who has that and an older VW Rabbit?