Nine_five_one

As some of you may or not remember but Im that rookie with the bent valves and such.

Im getting my head from the shop next week and I wanted to start cleaning my pistons I have some questions PLEASEEEEEE.

1.Whats the best and safest way to get those valve dents on the pistons out?

2.Whats the best cleaner to use?

3.Any other general info I should know while im in there!

Thanks for the help fellow 9 owners <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />

Perry 951

Easy Off oven cleaner and a Scotchbrite pad will remove the carbon deposits. Don't scrub the sides of the piston, and if the pistons are in the bores, make sure you get the crap out of the rings.

Get the piston you are working on just past top dead center, and after cleaing, crank the piston down a little to get the dirt. Follw that with a very liberal dose of oil around the rings, and crank it lower. Do this a few times until no dirt remains.

For the dimples, the biggest thing you want to check for is cracks. Once you have it clean, it should be somewhat easy to spot them. If it is cracked or spider webbed at all, replace the piston. The dimples can stay, and you can lightly grind down the high spots with a file.

Nine_five_one

AH good info... I got a can of car carb cleaner will that due as a cleaner...also is it common to have cracked piston when valves hit?

Thanks

chris walrod

You may want to try a little techron f/i cleaner. Puddle a little on the piston while its a 1/2" or so down the bore and let it sit for a half hour.

Good Luck!

Danno

I would actually have the pistons sitting at full TDC to avoid exposing the cylinder bores to any debris. Then you can wipe off the ring of stuff on top when you move the pistons down.

Do a side-by-side comparison test, like pistons #1 and #4. Use carb-cleaner on one and oven-cleaner on the other. Spread an even layer of each in the bowl of each piston, let sit for 5-minutes and wipe off. The results will speak for themselves.

Also did your valves make marks that look like this: <a href="http://www.gururacing.net/ImagesMisc/Pistons-951interference.jpg" target="_blank">Pistons-951interference.jpg</a>

Use a ball-shaped aluminum-cutting bit with a Dremel or die-grinder and smooth out the sharp edges on those spots where the pistons hit the valves. Any sharp edge or scratch on the piston is a potential heat-source and can cause knock/detonation.

Nine_five_one

Hey Danno Thats exactly what my pistons look like,

i will definately use your advice.
thanks bro