Cleaned pistons and other parts

[240260280]

Fired up the brass wire brushes, ultrasonic cleaner and bucket of spray 9 cleaner.  Also used Zep Purple for the heavy stuff.

All went well... now an expert at removing rings.

Can't separate the oil pump yet... it is a tough one.  My propane touch will convince it tomorrow.

[grannyknot]

Which engine are you working on now?

[240260280]

44 minutes ago, grannyknot said:

Which engine are you working on now?

260z for a friend.

[siteunseen]

12 hours ago, 240260280 said:

Fired up the brass wire brushes, ultrasonic cleaner and bucket of spray 9 cleaner.  Also used Zep Purple for the heavy stuff.

All went well... now an expert at removing rings.

Can't separate the oil pump yet... it is a tough one.  My propane touch will convince it tomorrow.

Those Webers you had in that ultrasonic cleaner, how did they come out?

[240260280]

I just did a few parts from some SK's when I first got the Ultrasonic,

Yesterday I did all 6 pistons.  They came out great.  3 things that make a difference:

1. Pre-cleaning helps.  I soaked pistons in hot water with Spray 9 heavy duty cleaner and used a brass wire brush to scrub. When the rings were removed I used a 4mm and 2mm ring cleaner to get the groves.

2. The ultrasonic bath must be very hot with a good cleaner (spray 9 again as it is nice to aluminum)

3. Run the ultrasonic for two 10min cycles with a movement between.

It is not nearly as nice as Duff'd vapour blasting but they come out very clean.

 

[siteunseen]

I have plenty of "before" pictures of those Webers I used to own we can use for the "after" comparison if you go that route. 

[Jeff G 78]

I tried to clean pistons and no matter what I used, they wouldn't come clean, so I gave them to my machine shop and they came back looking great.  Same with the front cover.

 

 

[240260280]

6 minutes ago, Jeff G 78 said:

I tried to clean pistons and no matter what I used, they wouldn't come clean, so I gave them to my machine shop and they came back looking great.  Same with the front cover.

 

 

I think next time I'll get a hot plate and big enamel lobster boiler and boil them with spray-9 to see how it works.

If you go the water cleaning route, you need to oil them to prevent rust, especially the spring metal plates inside.

I read that some have luck just soaking in diesel/furnace oil for 24 hours.

 

Edited March 23, 2018 by 240260280

[240260280]

Started to fit new rings (ITM).  
 

- FSM Gap range is 0.230mm to .0380mm (avg = 0.305mm)

- Rule-of-Thumb Gap range is 0.249mm to .0332mm (avg = 0.291mm)

 

- The gap for the original top ring in #1 was 0.69mm.

- The ITM gap is 0.290mm (perfect as is). 

 

Any idea why the stock gap was so big?  0.69mm = 0.027"  (maybe the previous engine builder mixed 0.27mm for 0.027") ?

Edited March 24, 2018 by 240260280
typo

[Captain Obvious]

I'm thinking the previous builder screwed up. I agree that it could have been a units issue.

Or maybe his math was just questionable. Math mistakes can crop up in the strangest places...  

1 hour ago, 240260280 said:

 range is 0.249mm to .0332mm (avg = 0.219mm)

 

[dutchzcarguy]

yeap... and 0.219 can never be the average of  0.249- 0.332    0.29 is more in the range..

8 hours ago, 240260280 said:

- FSM Gap range is 0.230mm to .0380mm (avg = 0.305mm)

also the point on the wrong spot hey...

 

[dutchzcarguy]

The oil ring has a play of 0.3 till 0.9 mm  maybe he mixed up top with oilring  ring gap...