Jump to content
Sign in to follow this  

Walnut shell grit size for intake valve cleaning?

5 posts / 6039 viewsLast Reply

Recommended Posts

Hi folks. Has anyone cleaned their intake vales by walnut shell blasting?

Eastwood sells 20 grit (which I think is about 1 milimeter) and another place provides 35/60 grit shells. Seems like the 20g would be better, but I'm only guessing. Many thanks!

Share this post

Link to post
Share on other sites

from the bmw-mothership :

Replacement media, 20/30 SAE or 0.45-0.80mm walnut shells can be sourced locally or through one of the following distributors:

MARCO® Corporate – 800 252 7848 Ext. 284 - marcousa.com/index.cfm

Trinity Tool Company - 800 587 4626 - www.trinco.com

McMASTER-CARR® - www.mcmaster.com

BMW Group Carbon Blaster

Order P/N 81 29 2 208 034

Price - $790.87


tool information

The carbon blaster is designed to remove carbon

deposits from the intake valves and intake ports

of the cylinder head. Refer to the attached Operating

Manual for further details. The maximum air

pressure input should not exceed 8 bar. Ensure

the shop air supply is regulated between 4 and

8 bar before connecting the carbon blaster.

The shop air supply should be dried using a general

purpose filtering system; the tool is not recommended

for use with a lubricating system. Water vapor in

the compressed air system will clog the filtering

screens in the carbon blaster. Repairs due to

water damage are not covered under warranty

Share this post

Link to post
Share on other sites

Thanks for the details! Been a long time since I re-did a head - I'd be cleaning the valves from the intake port, ie, head still in place.

Am I able to rotate the valves 180 degrees if I compress the valve spring and simply reach into the intake port and rotate the stem or is fit too tightly to be able to rotate the valves? MANY thanks!

Share this post

Link to post
Share on other sites

shouldn't need to rotate the valves - you leave the blaster

running long enough and some permit you to wiggle

the point of discharge so the media will reach all around

the guide/stem for total cleaning

Share this post

Link to post
Share on other sites

Many thanks! I'll look for a small, maybe angled nozzle so I can get better accss than a "straight shooter."

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.