Decking block question...

How the engine works

Moderators: Greenleaf, KTA, BC847, Richie O

Decking block question...

Postby Remps » Sat Apr 04, 2015 12:04 pm

Does the rotating assembly gotta come out to deck a block?
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
User avatar
Remps
14mm rotor
 
Posts: 1128
Joined: Sun May 03, 2009 12:57 am
Location: Saskatchewan

Re: Decking block question...

Postby RCCUMMINS89 » Sat Apr 04, 2015 12:17 pm

Yes. As the pistons rise above the deck factory.


Well......I guess perhaps it would depend on the machine shop. Because there is a point where you can turn the engine, where all pistons are slightly below... but then you're still going to get tiny shavings all down in around your pistons and walls.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
RCCUMMINS89
14mm rotor
 
Posts: 4826
Joined: Mon Oct 03, 2011 4:19 pm
Location: Spirit Lake, ID

Re: Decking block question...

Postby fatty » Sat Apr 04, 2015 12:32 pm

Yeah it needs to come out. There would be no way to keep shaving out of the cylinders otherwise.
91.5 w250
fatty
14mm rotor
 
Posts: 802
Joined: Tue Nov 04, 2008 8:52 pm
Location: Washington
Top

Re: Decking block question...

Postby Remps » Sat Apr 04, 2015 12:54 pm

:oops: I shoulda known that. Looks like that ain't happening either then. Just won't have time. Gotta do this swap in 3 days or less, just can't afford any more time off then that. Maybe a 20 over gasket will be a little more forgiving on a block that's not perfectly flat? The head gasket doesn't leak on the ve motor I am using, so I am hoping it will hold just as good with the perfectly flat head off the 96?
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
User avatar
Remps
14mm rotor
 
Posts: 1128
Joined: Sun May 03, 2009 12:57 am
Location: Saskatchewan
Top

Re: Decking block question...

Postby fatty » Sat Apr 04, 2015 1:06 pm

Might be cheaper in the long run to do it now. Do you know for certain it's out of spec?
91.5 w250
fatty
14mm rotor
 
Posts: 802
Joined: Tue Nov 04, 2008 8:52 pm
Location: Washington
Top

Re: Decking block question...

Postby Remps » Sat Apr 04, 2015 1:44 pm

I've never had the head off the D250, so I don't know. Guessing it's not perfectly flat though. Just pulling the rotating assembly would snowball into new rings, honed cylinders, arp rod and main bolts, cam,lifters, etc etc.. It is actually my smoothest running engine of the four, I'd rather leave it alone. It's just leaking from everywhere. Idk... Maybe I should just leave it alone, attached to the 727. And pull the engine out of my 93 (my first cummins, not in sig) gut it, have it machined back home, (NO way I would bring it to ANY shop here) and just order a complete rebuild kit, and build/install the engine myself here. My boss has a shop a little ways out of town I could get an engine stand into, and could be stored inside till ready. And give the 96 another oil change with a couple bottles of Lucas goop and hope it doesn't blow in the next few months... Hmmm... I'm guessing I could have all the part$ together before July, when we want to go on a little road trip.. I think I will make up my mind soon....very soon... :P
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
User avatar
Remps
14mm rotor
 
Posts: 1128
Joined: Sun May 03, 2009 12:57 am
Location: Saskatchewan
Top

Re: Decking block question...

Postby RCCUMMINS89 » Sat Apr 04, 2015 2:43 pm

That's how I would do it.... pull apart your roughest engine, and go through it. In the meantime, re seal this one and enjoy
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
RCCUMMINS89
14mm rotor
 
Posts: 4826
Joined: Mon Oct 03, 2011 4:19 pm
Location: Spirit Lake, ID
Top

Re: Decking block question...

Postby Remps » Sat Apr 04, 2015 3:14 pm

Well it'll either be a quick reseal and swap the motor from the 90 into the 96, or build the 93 motor and hope the 96 doesn't give out in the next few months.. Waiting on the word for the shop space right now, I guess that'll be the deciding factor. Gots nowhere else I could possibly assemble a motor here.. Unless the old lady don't mind a cummins coffee table, and plywood on the floor? :lol:
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
User avatar
Remps
14mm rotor
 
Posts: 1128
Joined: Sun May 03, 2009 12:57 am
Location: Saskatchewan
Top

Re: Decking block question...

Postby Remps » Sat Apr 04, 2015 5:13 pm

So no go on shop space. So much for that idea.
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
User avatar
Remps
14mm rotor
 
Posts: 1128
Joined: Sun May 03, 2009 12:57 am
Location: Saskatchewan
Top

Re: Decking block question...

Postby PToombs » Sat Apr 04, 2015 5:13 pm

Are you decking the head? If so, don't worry about the block. If it hasn't been overheated bad it should be ok. You can check it easy enough, if it's close it should last a long time.
pete

Just enough power to break everything behind the crankshaft.
User avatar
PToombs
14mm rotor
 
Posts: 11367
Joined: Sun Jan 07, 2007 6:13 pm
Location: Syracuse NY. Snow central!
Top

Re: Decking block question...

Postby Remps » Sat Apr 04, 2015 7:32 pm

I think one of the previous owners of the 96 had the head replaced, I had it checked and magnafluxed 40000 kms ish ago, perfectly flat, not a single hairline crack. Valves vacuum tested good. Haven't really abused it since. Probably get it checked again. Putting the 96 head on the 90 engine, btw.
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
User avatar
Remps
14mm rotor
 
Posts: 1128
Joined: Sun May 03, 2009 12:57 am
Location: Saskatchewan
Top

Re: Decking block question...

Postby dpuckett » Wed May 20, 2015 9:42 pm

I'm with Pete, I wouldnt worry about the block being out of flat. Factory spec is .012" end to end. My head was .007" warped. Machine shop flattened it, I put it on and torqued to 125 ft-lbs. so far, so good.

DP
His- 93 W250 club cab LE, auto to Getrag conversion, piston lift pump, 3.54 LSD. 400k+
Hers- 04 QC 4x4. Built auto, Triple Dog, Air Dog. Funny Round truck that aint so quiet.
dpuckett
14mm rotor
 
Posts: 2196
Joined: Wed Jan 03, 2007 4:33 pm
Location: Perryville MO
Top


Return to Engine

Who is online

Users browsing this forum: No registered users and 12 guests