Hi,

I was generously donated an engine which I've just started stripping down. It's a 998 with an 850 head. It's the first time I've pulled down an engine so its pretty exciting

I've taken the head off and am wondering what the bore is.... the top of the piston's are marked :

B
Front M2039 A52

Can anybody get any info from that or do I need to measure the bore with a vernier?
Next task is to get my hands on a flywheel puller and start dismantling that

dewey

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dwightgunning.com

Stock 998 bore, piston grade B, probably. If oversize it would be marked .020, .040 etc.

Have fun!

BTW, the 850 and 998 Deluxe heads were exactly the same (12A1456), Cooper was different.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Cool.

I've also got a 12G202 head here as well so I will probably see if its good enough to use when I rebuild...

How much do flywheel pullers go for usually?

dewey

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dwightgunning.com

Flywheel pullers they sell here are all shitty, too weak. Taiwanese or Chinese rubbish...

Just get a circle of 3/4" plate cut 5" diameter, stick weld a 1" or 1-1/4" UNF hex nut to the middle, drill 3 holes 3/8" dia on 3" PCD for 3x grade 8 bolts- 3/8" UNF x 3-1/2".

Centre bolt in mine is 1-1/4" UNF x 2-1/2" long (it's a big-ass puller... )

To protect the end of the crank, I use a 5/8" bolt cut 1/2" long, and its shank turned down to 1/2" so it fits inside the crank.

Oh, and a 1-1/2" socket, bar and length of pipe is handy too..

<edit> and a VBFH...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

fly wheel puller 48.87
from karcraft

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Anonymous moderation means the agro that is built up towards the mods isn't aimed at an individual (fewer "Makk" attacks). Less stress for mods means less moderator "retirements".

Karcraft's is better than some but still not real solid, IMO.

Even with my bullet proof one, a 3/4" drive socket and 3 ft of pipe, there have been times it just made it- 1275s and bigger engines can really fret the flywheel on hard sometimes.
small bores aren't so bad.

Tip- whatever one you get, use only grade 8 bolts, and oil all the bolt threads..
Nothing more sad than watching a flywheel puller bolt strip in the flywheel..

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

doc , that reply is the most confusing thing iver read but u make it sound so simple
"Just get a circle of 3/4" plate cut 5" diameter, stick weld a 1" or 1-1/4" UNF hex nut to the middle, drill 3 holes 3/8" dia on 3" PCD for 3x grade 8 bolts- 3/8" UNF x 3-1/2"."

lol is that all mate!

Yeah only a couple of hours work if you're a metal man..

My puller has about 5 lots of holes in it now- whenever I need to pull something new (eg 70HP outboard flywheel) I just drill another set of holes...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

ahhhh if we only could do that lol
doc could do it in his sleep with one hand holding a tinnie and a plasma cutter in the other
makka

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Anonymous moderation means the agro that is built up towards the mods isn't aimed at an individual (fewer "Makk" attacks). Less stress for mods means less moderator "retirements".

Just for the non metal working people.....

1 inch = 25.4mm
Metal plate - 5in dia (round), 3/4in thick
UNF - a fine thread pitch
PCD - Pitch Circle Diameter
Grade 8 bolts - Refers to metal composition

Sorry Kev, but I gathered from a reply that some people didn't know this.

Hey Dewey, if you arn't really mech minded - be careful using pullers. You can wind them up quite tighly and when the let go it is usually with a bang!!! Cheap pullers are probably not worth it as they can break and maybe damage YOU!

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"Show me the Mini!"

Treat them like a skyrocket- stand well clear during use.. I've seen a flywheel with puller attached, travel 3 feet...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

The scary crap is I understood everything Doc was saying about making the puller. Ah well. One day I'll get around to remembering what Metric is.............. But it wont be in a hurry.


3/4 Inch thick?? What the hell are ya cutting that off???

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"He's always been a dickhead, He always is a dickhead, He will always be a dickhead. So stop complaining when he acts like one."

3/4" steel plate, of course... easy peasy with an oxy... crap, in the `60s I used to cut train wheels off axles, they were 9" thick...

<edit> and we got docked if we nicked (gouged) the axle...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I've pulled a flywheel before with the guidance of an expert. I just don't have the tool myself & I don't think I'd be capable of welding one up.

I'll search around and maybe somebody will have a spare they can sell me or somethin.

No big rush, I've got uni work coming out my arse & working full time as well so its no rest for the wicked.

dewey

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