|
Melling Big Block HV Pump Shaft Siezed - Anyone Else?
#984376
05/01/11 10:49 PM
05/01/11 10:49 PM
|
Joined: May 2007
Posts: 1,443
Maryland
Dads426
OP
pro stock
|
OP
pro stock
Joined: May 2007
Posts: 1,443
Maryland
|
Had 7 passes on the new motor and on the drive back to the pits oil pressure falls to 30 lbs and the motor starts knocking. Pulled the pan & #2 main is down to copper, #3 rod is worn with no crush. All other bearings OK. Thought the bypass stuck so I pulled the pump and the drive in the pump won't turn. Put a spare drive shaft in it and it turns, but takes a lot of force. Pulled the pump apart and the shaft is not scored, but the fit in the pump is very tight. It spun freely when it was put together. Anyone else have this problem? I have a spare pump that turns freely, but reluctant to use it. Any thoughts? Why did only #2 main wipe?  Crank was not hurt. Tempted to throw new bearings in it and a new pump and try it again
2012 422 Allstars NSS Champion
2013 422 Allstars NSS Champion
2014 422 Allstars NSS Champion
|
|
|
Re: Melling Big Block HV Pump Shaft Siezed - Anyone Els
[Re: Dads426]
#984380
05/02/11 12:46 AM
05/02/11 12:46 AM
|
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
master
|
master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
|
Quote:
I was able to pull both halves on #3 and they were very worn, but not down to copper. Number 2 rod which is fed from the same main was OK. I was able to polish the crank in the block with 600 grit and crocus cloth (picture is before polishing). Oil holes in the crank are clear; not sure about the block. I may end up pulling it; I do have a spare shortblock.
Your kidding , right? polishing the crank in the block? maybe thats why you have a problem with your engine now. How are you going to clean the grit out and other debree that the bearings pealed off? Do yourself a favor and pull the engine apart, clean and inspect it will be cheaper than just putting in another set of bearings and blowing it completely up.  
it's ok to butt heads, just don't do it with a butthead
|
|
|
Re: Melling Big Block HV Pump Shaft Siezed - Anyone Else?
[Re: Bob_Coomer]
#984381
05/02/11 01:02 AM
05/02/11 01:02 AM
|
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
CompSyn
pro stock
|
pro stock
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
|
Quote:
Quote:
In my opinion that engine must be torn down and gone through completely.Trash from the bearings could be anywhere waiting t tear something else up.
I would think the bearing wear would be from a piece of something lodged in the oiling hole blocking flow,hard to tell for sure without looking at everything.I would bet the crankshaft would at least need polished.
Keith
I agree
Look close at those rod bearings, they are the last to see oil. And some time the cap side looks good and the upper rod shell is toast. More so opposite for the mains.
Have a old friend that has been building and racing Mopars for as many years that I have been around. I once mentioned Melling Oil pumps... he says JUNK... Not really given a reason, but he prefers TRW/Speed Pro and Sealed power pumps..
I like the original oil pumps off old engines.. People will trash them, I will dig them out and pull them apart... I have found some good ones too.
This from 440Source:
Quote:
Melling M-63HV High volume oil pump assembly. Completely brand new, assembled and ready to install. Currently, the only manufacturer of aftermarket oil pumps for the big block Chrysler is Melling Engine Parts. Melling has been in business since 1947, for over 6 decades. They currently manufacture over 3 million oil pumps every year. For most all applications, we recommend the high volume unit, M63HV. Aside from the billet and aluminum racing pumps made by Milodon, Keith Black and others, Melling is THE only source for stock replacement type cast iron pumps. Don't forget gaskets and attaching bolts as well (listed separately.) - http://store.440source.com/Melling-M-63HV-High-Volume-Oil-Pump-New/productinfo/M63HV/
Does TRW/Speed Pro, Sealed Power make their own pumps and if not is Melling their supplier?
I was advised by a friend after I built my 440 and had it on the road to take the Melling oil pump apart and make sure there were no shavings inside it. Luckily I didn't have any problems as it was too late.
|
|
|
Re: Melling Big Block HV Pump Shaft Siezed - Anyone Else?
[Re: Dunnuck Racing]
#984385
05/02/11 02:20 PM
05/02/11 02:20 PM
|
Joined: Jan 2003
Posts: 25,823
Rio Linda, CA
John_Kunkel
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,823
Rio Linda, CA
|
I had a brand new Melling HV pump seize while priming the engine with a drill. While I had taken great care to pre-lube the rotors and pack the cavities with Vaseline I hadn't thought to lube the inner rotor shaft.
I had never pre-lubed a rotor shaft on many previous builds and never had a problem (I thought) but a dry rotor shaft might cause some minor galling that doesn't appear as a problem until later.
The INTERNET, the MISinformation superhighway
|
|
|
Re: Melling Big Block HV Pump Shaft Siezed - Anyone Els
[Re: maximum entropy]
#984387
05/02/11 03:24 PM
05/02/11 03:24 PM
|
Joined: Feb 2003
Posts: 10,214
Someplace you aren't
SomeCarGuy
I Live Here
|
I Live Here
Joined: Feb 2003
Posts: 10,214
Someplace you aren't
|
I had a Melling pump die on me after less than 1000 miles in 2009.
I had taken it apart before use, everything checked out OK.
Replaced with a Sealed Power. Hope that Melling didn't make it.
I want my fair share
|
|
|
Re: Melling Big Block HV Pump Shaft Siezed - Anyone Els
[Re: DoubleD]
#984389
05/02/11 09:41 PM
05/02/11 09:41 PM
|
Joined: Jan 2003
Posts: 16,928
NC
440Jim
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,928
NC
|
Quote:
If you seize a pump - usually it breaks the hex end off the shaft - My guess is your clearances were not right or you were sucking the pan dry - either way - that thing needs to come apart or it will come apart by itself if you cobble it back together again. Big block oil pumps are pretty stout by design and rarely fail by themselves - usually they fail when junk gets run through them.
But I can't rule out a pump problem. But the pump may have failed from the bearing debris.
|
|
|
Re: Melling Big Block HV Pump Shaft Siezed - Anyone Els
[Re: 440Jim]
#984391
05/02/11 09:50 PM
05/02/11 09:50 PM
|
Joined: Jul 2008
Posts: 30,431
Florida STAYcation
BeEtLeJuIcE !
The village idiot's idiot
|
The village idiot's idiot
Joined: Jul 2008
Posts: 30,431
Florida STAYcation
|
YOU SHOULD have been running some of that 10$ a quart SYN stuff .....you know that stuff that some claim you could drain the oil and run it for miles WITH OUT any oil .....  ...some of those claims they make ....   BUMMER about your prob though ...seriously. I also agree .. the motor should come out to be safe. GOOD luck ...It could only need new bearings and maybe a crank polish.
|
|
|
Re: Melling Big Block HV Pump Shaft Siezed - Anyone Els
[Re: BeEtLeJuIcE !]
#984392
05/02/11 10:04 PM
05/02/11 10:04 PM
|
Joined: May 2007
Posts: 1,443
Maryland
Dads426
OP
pro stock
|
OP
pro stock
Joined: May 2007
Posts: 1,443
Maryland
|
Thanks for the replies. I decided to pull the motor and put in the spare 493. I will go over the entire motor with a fine tooth comb. It is too nice a shortblock to just throw bearings in and risk losing it. I did get a reply from melling and they want the pump back. The shaft is not scored; it is just really tight in the pump housing; like the clearance closed up or the shaft is bent. I have other rotors, so I may see if it is a bad rotor or pump housing (just to see what is wrong). The intermediate shaft was not twisted nor was the bronze gear worn (as hard as the pump was to turn I expected to find a problem there). With all the oil flying around in there, that is the last place I expected to run dry. But, I agree with Andy (BTW, love your book). I think the bearing started to go or something got into the pump and caused the problems. Good thing it didn't happen at 134 mph  (Oil pressure dropped on the return road).
2012 422 Allstars NSS Champion
2013 422 Allstars NSS Champion
2014 422 Allstars NSS Champion
|
|
|
Re: Melling Big Block HV Pump Shaft Siezed - Anyone Els
[Re: flynbyu]
#984394
05/02/11 10:32 PM
05/02/11 10:32 PM
|
Joined: Oct 2004
Posts: 5,618
long island NY
Ari440
master
|
master
Joined: Oct 2004
Posts: 5,618
long island NY
|
did you torque the oilpump on or just tigthen it ?
if you over tigthen it it will bind up
1.39 9.85 - 137 mph
|
|
|
|
|
