Gallery, Projects and General > Gallery

Jag V12 cylinder head puller

(1/3) > >>

AdeV:
These things are available to purchase... but having a milling machine, a nice large piece of 10mm steel plate, it seemed silly to shell out £200+ on something I could make myself...

So, a bit of CAD:


A bit of CAM:


A nice piece of steel:


Drilling the holes:


Milling the profile:



I can't show you it in use yet, it's still milling out the profile! At 1.2inches/minute, it's going to be a little while...

CNC is SO cool. OK, if I'd not gone with the fancy edges, I'd have probably had it done by now on the manual machine... but it'll look so much more expensive done this way  :beer:

AdeV:
Nearly there with the profile. About 40 minutes per pass, 4 passes @ 0.100" deep. I might have gone faster, but this stuff is evil to machine. It left hairy burrs all around the edges, top & bottom:



A quick lick with a flap disk in the angle grinder, to deburr, then it's test fit time. Needed to tap it on with a plastic hammer, but then the studs are only a smidgeon under the 8mm hole size that I cut:



Finally, thread the 8 outer holes M10 - that's the hardest tapping I've done in a long time. The tapmatic struggled... but we got there.

Final fit:



The long bolts push down on the head studs. The middle set of holes is attached to the cam carrier studs, which are attached only to the head. Thus, by progressively tightening down the outer bolts, the entire head is lifted bodily off the block. I couldn't resist giving it a tweak, and was rewarded by the happy sound of a head gasket letting go the grip it's had since nineteen soaking wet. The lifting eye in the "middle" can be attached to the engine hoist, to assist with lifting the head off gently when it's off the studs.


Now.... the sharper eyed amongst you may have noticed a slight problem..... Yep, it's too damn short! By nearly half, to be exact. Since I lacked the appropriate length of steel to make it in one piece, and even if I had the mill wouldn't have done it in one swipe... I'm making it in 2 pieces. Which, assuming I don't completely horlicks my measurements, will end up just the right distance apart to be welded together into one piece. Or maybe not, it'll work just as well as a 2-piece part, and not welding it will at least guarantee it doesn't warp & not fit.

vtsteam:
Pretty slick, Ade! :clap: :clap: :clap:

AdeV:
Thanks! I can't claim it's an original idea... this is the simpler version, there's also a massively overcomplicated (IMHO) 2-plate version with even more bolts to turn & settings to set.

Anyway, today I managed to make the other half:


And it works! Unfortunately, I ran out of length on my bolts... time to order some extra-long ones!


Either that or I make some spacers, but I haven't got any suitable rod in stock, so tomorrow I'll have to break out the credit card again...

Oh - and the reason the tap was struggling so badly - the holes are all marginally undersize... and this is one tough bit of steel. Reckon I must have worn my poor roughing cutter out...

Brass_Machine:
Nice job Ade. Like you, I would rather make than buy if I can (for the most part).

I am blind... What Cad/Cam?

Eric

Navigation

[0] Message Index

[#] Next page