You are going to find that the piston pins are some of the closest tolerance pieces in the engine and they wear very little, if any. About the only thing that I've seen "kill" the pins is when "bead blasting" debris gets left in the intake manifold and gets sucked into the engine. The wrist pins and bushings, when this happens, get amazingly worn. You can break a fingernail on the "ridge" left on the piston pins.

If the pin bushings were fine with the old pins, they should be fine with a replacement pin.

 

Theres definitely no scoring on the bushings. Its seems like they should be fine from what you describe. Appreciate it, Dave

 

I have a set of 8 pistons from an 88 engine, I can sell the complete set for $146, These have the extra oil drain holes drilled on the sides of the piston.
They are tolerance 1.
Let me know if interested.

 

OK...I'll bite.

Although that sounds like a great price for a set of pistons, how did you come up with that number?

 

Isn't the number stamped in the block?

 

PM Sent

 

If you are asking about the price, I just made it up. I know Rob sold a set of tolerance 2 a few years ago for around 2 to 300 bucks.

used internal 928 engine parts are useless in value, at least it seems like that. As I recall Mark was planning to trow a bunch of crank shafts away due to not being able to sell them? Complete S4 engines are not going for much these days.

I just looked at them today after work and some surface corrosion has started on the ends of the pins. Few very tiny black spots, you can't feel anything with your nail, no orange spots or holes though. I had them cleaned up when I took them out of the engine and sprayed down with WD40, should have used engine oil for storing. I think using a very fine scotch brite should clean them up. Will the same process as crank polishing work? I did not know they looked like that last night I made the post.

I already told the OP they have this issue.

Dave,

If you are still interested I can send the set to you for the cost of shipping, once you get the stuff and they turn out to be re usable, you can pay me for what you think they are worth. If they are not reusable, well then, they are yours to keep.

Thanks
Ali

 

So I was able to get ahold of a set up pins / pistons / and rods. Pistons have dents all over them, so they are garbage, but they're TG-1 anyway so no loss to me. Rods look perfect, so maybe thats a bonus here. Pins are something I wanted to toss out for an opinion...

When I measured them, they measure somewhere between .9448" and .9447" or within the range of WSM acceptable (.9449" - .9447"). They feel very smooth, I can catch a nail on one area of one pin...it pretty subtle though. I'm wondering about the scoring marks visible on each pin. Mine looked much better, but everything in my engine looks better since it was never used. I'm wondering if these pins pictured are usable of if the pistons / pins are both junk, and I should look at other options. Is the scoring on the piston normal (pic #3 below) for some cars, or was this just a trashed engine?

Pics of the pins.
http://www.flickr.com/photos/51967142@N00/7545775284/
http://www.flickr.com/photos/51967142@N00/7545772766/
Here is the piston the rod came out of...
http://www.flickr.com/photos/51967142@N00/7545782996/

 

Looks like varnish to me. Wipe them down with some Berryman's B12 and see what you get. If they measure I would use them.

 

Nope, B12 did touch them unfortunately. Some polishing compound helped a little. If I can find better at a reasonable price that's my preferance, but these'll probably do though if no other options...


Tough to source at a reasonable price / quantity....

 

Strange looking pattern.

I didn't know you were still "fighting this fight".

I went over to my engine section and I do have a brand new set of factory pins, which I removed from a set of brand new pistons that I had custom pins made for.

$100 plus whatever the shipping cost is. Call Mary and have her ship them, if you are interested.

714 879 9072

 

These are great quotes. Somebody collect them and publish a book.

 

Yes! I'll take them if they'll fit my '87. I'll call Mary 1st thing Monday. Thanks so much Greg!

 

Big thank you Greg! Pins were mint, and fit perfectly. Thanks so much for helping me out!


I stumbled across crocus cloth in my local True Value when picking up a sprinkler head. $0.99 / sheet for medium grade, and $1.29 / sheet for fine grade. Much better than the $50-$70 / pack sellers wanted online!