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Pulling down an engine
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Author:  dewey [ Sun Apr 18, 2004 3:19 pm ]
Post subject:  Pulling down an engine
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
Author:  drmini in aust [ Sun Apr 18, 2004 3:30 pm ]
Post subject: 
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.
8)
Author:  dewey [ Sun Apr 18, 2004 3:42 pm ]
Post subject: 
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
Author:  drmini in aust [ Sun Apr 18, 2004 4:39 pm ]
Post subject: 
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... :P )

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.. 8)

<edit> and a VBFH...
Author:  min13k [ Sun Apr 18, 2004 5:49 pm ]
Post subject: 
fly wheel puller 48.87
from karcraft
Author:  drmini in aust [ Sun Apr 18, 2004 10:34 pm ]
Post subject: 
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. :wink:

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.. :x
Author:  leylandaus [ Mon Apr 19, 2004 7:35 am ]
Post subject: 
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! ;)
Author:  drmini in aust [ Mon Apr 19, 2004 8:11 am ]
Post subject: 
Yeah only a couple of hours work if you're a metal man.. :wink:

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... :P
Author:  min13k [ Mon Apr 19, 2004 11:27 am ]
Post subject: 
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
Author:  minitec [ Mon Apr 19, 2004 12:06 pm ]
Post subject: 
leylandaus wrote:
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! ;)


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.
Author:  9YaTaH [ Mon Apr 19, 2004 1:37 pm ]
Post subject:  Be Careful
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! :roll:
Author:  drmini in aust [ Mon Apr 19, 2004 1:48 pm ]
Post subject: 
Treat them like a skyrocket- stand well clear during use.. :lol: I've seen a flywheel with puller attached, travel 3 feet... :!:
Author:  PhildoD [ Mon Apr 19, 2004 4:53 pm ]
Post subject: 
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???
Author:  drmini in aust [ Mon Apr 19, 2004 6:53 pm ]
Post subject: 
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... :P

<edit> and we got docked if we nicked (gouged) the axle... :roll:
Author:  dewey [ Tue Apr 20, 2004 10:18 pm ]
Post subject: 
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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