1983 Volvo 244 transformation from D24 to D24TIC - Page 4

pgringo · #31 02-17-2012, 10:43 PM

unreal.

...

Volvoist · #32 02-20-2012, 03:12 PM

I'd never use a fiber gasket... Get the MLS gasket from Volvo. I'd stay with the one notch if possible. It'll give you more power.

anders · #33 02-24-2012, 06:21 AM

Well I measured the bores on the rebuilt engine that came out of my car last night. The smallest measurement was 77.44 and largest was 77.50. So The bores are way out of spec for .5mm over and real close to 1mm over. So I'm not sure what the heck happened when they built this motor. I will compare measurements with the 1mm pistons I have this weekend.

michaelovitch · #34 02-24-2012, 09:43 AM

what was the temperature of the parts you have measured ?

anders · #35 02-24-2012, 11:26 AM

It was about 45 F.

michaelovitch · #36 02-24-2012, 11:38 AM

All your measurments MUST be taken with parts an measurment tools at 20 °C (68 F)

If you redo it with this temp you will not have the same results.

It's a norm in machine shops here that allow accurate readings for everybody.

give it a try

anders · #37 02-24-2012, 03:15 PM

Well I would hope 23 degrees in temp would not make the cylinder wall contract/expand 20 thousands of an inch, there would be major problems with operating temp ranges of 200+ degrees.

michaelovitch · #38 02-24-2012, 03:43 PM

You are certainly in the second bore over standard + 1 mm

77.51 mm pistons are for the second bore over standard : cylinders should be 77.48 with a max wear of 4/100

so if you have 77.44 to 77.50 while you took it in a cold weather you can understand few things :

the metal is retracted and your measurments are bad.
the machine shop did a very bad job
your tools are not accurate enough (or you )
you have wear yet and your measurments are not accurate enough because of the cold weather giving 4/100 off

it can't be the first bore over standard : your measures do not approach the specs at all.

green book specs are not given for 45 f outside temps whatever you can tell me about operating temps

(wich is right btw).

no offense but if you want to speak accuracy do it right
that means at around 20 °C.

A machine shop owner told me he do not measure parts till his shop is heated enough in winter or after a hot tank cleanup.
that's common sense.

anders · #39 02-27-2012, 07:04 AM

The engine builder who built this engine did a bad job. The engine had 76.98 mm pistons in it( measurement stamped on pistons), second oversize according to my green book ( 1st over size is .25 mm over). I brought the block and 1mm oversize pistons to the engine shop and the cylinder bores can not be finished out to the last oversize. So they confirmed what I thought. Oh BTW you got your numbers backwards ( 77.51 pistons will not fit in a bore of 77.48

) My wife won't let me measure it accurately, She doesn't like engine blocks in the living room! I don't have heat in my shop...

As for measurements 68 degrees is ideal, But the most important is to have all the parts and tools at the same temp. I would have to say that 95% of all machine shops don't have a controlled environment of 68 degrees, at least in my area.

But enough of the bickering, the measurements were "rough" and confirmed that the engine was improperly built.

michaelovitch · #40 02-27-2012, 08:17 AM

Damn that sucks !

They did a pig job.

you right about the psitons wich couldn't fit

It was 2:00 AM.....

So what do you plan now ?

you re use the pistons and scrap the block ? or remachine a new block ?

it's about the same price no ?

here it's 100 euros a bore and 100 euros a piston (with a "special" price)