Isuzu G-series Twin Cam

anyone know the g180w valve clearances?? just so i got another thing to check on the weekend to try track this noise down.

I could be completely wrong (in which case I'll look like a dickhead) but I don't think there's any valve clearance specification in these engines, because nothing can be adjusted easily. I guess you'd just want to know the shims are only just being contacted (or not at all) by the cam lobes when closed, but they're being opened as much as possible by the cam lobe.

The only way to adjust as far as I know would be either putting little washers under the cam buckets/shims, or getting a cam regrind...

If I were you I'd just eyeball it, see if the cam lobes are contacting the shims when closed, and if so, try to figure out how much pressure they're applying (can you rotate the shim by hand whilst the cam is touching it, with valve closed?) etc.

But I leave it open to those with more experience with these engines to post the RIGHT way of doing things, not guesses... lol

yeah i was jsut chasing the numbers so i could check them to see if anythign was out of the ordinary, but i think its jsut a slight exhaust leak now so once i fix that ill know for sure.

there are valve clearances i just can't remember what they are.

They all have some sort of clearance even if too difficult to adjust. Even desmos have zero clearance specified (where negative gaps are not recommended!)
I think the clearances are the usual 0.25 & 0.30mm (in & ex) but I too amn't sure. Oi - Poida!

i ran the same sclearance as the toyota 18r* 1.8 twin cam