Alusil cylinder reconditioning - “hone by hand” using Sunnen an-30

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Alusil cylinder reconditioning - “hone by hand” using Sunnen an-30 - BMW M62B44tu

Рет қаралды 2,860

Күн бұрын

Using the factory prescribed Sunnen An-30 paste to buff alusil cylinders by hand.
Update: engine started up great with no oil burning or other ring seal issue. Doing this process definitely increased cylinder wall oil retention and brought a bit of the Oem surface finish back. Highly recommended.

Пікірлер: 23

@Stiefe300 Жыл бұрын

Thanks for the information. Really good trick to get a little bit more live out of the alusil blocks.

@JesseBreaks Жыл бұрын

I’ll update again when it’s back together to let everyone know if it changes leak down results or causes oil burning but given the mechanism of action of Sunnen An-30 I couldn’t see that it wouldn’t be beneficial to try.

@Bad_handle Жыл бұрын

@@JesseBreaks any news? about to give this a shot for a refresh before e30 swap...

@Seagrams 11 ай бұрын

Clever idea man. If it works then it aint stupid

@StudioGoldsmith 10 ай бұрын

Hi! I've got an audi with an alusil block. There are 0 scoring marks, they look perfect; BUT there is like slight discoloration on the edges of the walls. As if the sides were more shiny, when the walls otherwise are kinda 'milky'. My tech told me it's a coating that has worn out. It is a linerless design tho...

@JesseBreaks 6 ай бұрын

Yes Audi uses this same process. The milky appearance is the micro texture left by the paste, fine scratches to allow for lubricant adhesion. If the cyls polish off they will eventually score due to lack of lubrication.

@tylerroe5175 Жыл бұрын

Hey there 🤙🏼 I’m currently rebuilding a 4.6is engine from a 2003 X5 4.6is. I’m really wanting to completely re-ring it and replace one piston that had minor surface damage so it doesn’t develop hot spots. I’d love to chat with you more in depth about the step-by-step on this because I don’t want to fuck up this block. They’re virtually impossible to find now and it’s in pretty damn good shape for its 200k+ mileage. The AluSil walls are really freaking me out cuz I don’t want to mess up that Silicon crystal formation at all or not bed the new rings in properly. Really would appreciate the help!

@JesseBreaks Жыл бұрын

Hey Tyler, I have lots of info and experience to share on these. Are you able to DM me on here, or is there a way I can reach you?

@jacobokun9135 9 ай бұрын

Any recommendations for wear on the camshaft journals in the cylinder head? I have some heads with minor wear in some of the cam journals and caps. Some barely catch a fingernail but it’s noticeable and I’d like to clean it up

@JesseBreaks 6 ай бұрын

Take an extremely fine grit paper like 1000-2000 grit, remove cam and bolt the cam cap back on, and lightly buff out and smooth the scoring. Low spots in the scoring aren’t the issue, you just want to remove the high spots and smooth out the journal surface. No need to polish any light texture from the paper will hold oil and help retain oil pressure.

@driving_in_YYC 5 ай бұрын

have you ever found a source for felt pads that you could use on a drill or something much like a stone or ball hone?

@JesseBreaks 4 ай бұрын

Yes. The ultimate solution for this is the Lisle 15000 ridgid hone. Each set of lisle stones comes with wiper felts. You simply buy the felts and run them with the An-30 paste for perfect results.

@driving_in_YYC 4 ай бұрын

@@JesseBreaks thanks!! 😁

@tooththrhr Ай бұрын

I have an m113k alusil block with scratched cylinder walls...could I use this paste to fix my block ?

@JesseBreaks Ай бұрын

If the cylinder walls are scored you will need to overbore until scoring is removed, finishing with 800 grit stones and then this AN-30 paste. Will require larger pistons and rings etc.