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SMALL BLOCK OIL PUMP DRIVE #278942 04/05/09 11:02 PM 04/05/09 11:02 PM
Joined: Aug 2007 Posts: 316 Ohio L Lil Wedge OP enthusiast
Lil Wedge OP enthusiast L Joined: Aug 2007 Posts: 316 Ohio	71 360 block and oil pump drive is very very difficult to install.Been this way for a couple of seasons and I have installed new bronze bushing and drive.bushing slide on shaft easily ,installed it and shaft doesn't want to go in. Did this twice, Now I have the engine out, and if the oil pump is off it just falls in, bushing is seated correctly but rod is off center slightly, if drive is installed ,oil pump goes on easy enough and seats but can't prime the engine that way. I champhered the very tip of the drive (1/4 in.)and it is better. Any ideas?

Re: SMALL BLOCK OIL PUMP DRIVE [Re: Lil Wedge] #278943 04/05/09 11:13 PM 04/05/09 11:13 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: 71 360 block and oil pump drive is very very difficult to install.Been this way for a couple of seasons and I have installed new bronze bushing and drive.bushing slide on shaft easily ,installed it and shaft doesn't want to go in. Did this twice, Now I have the engine out, and if the oil pump is off it just falls in, bushing is seated correctly but rod is off center slightly, if drive is installed ,oil pump goes on easy enough and seats but can't prime the engine that way. I champhered the very tip of the drive (1/4 in.)and it is better. Any ideas? Open up the bushing slightly

Re: SMALL BLOCK OIL PUMP DRIVE [Re: MR_P_BODY] #278944 04/06/09 12:03 AM 04/06/09 12:03 AM
Joined: Jan 2003 Posts: 13,610 md M mopars4ever I Live Here
mopars4ever I Live Here M Joined: Jan 2003 Posts: 13,610 md	There is a tool for installing the bushing. The tool will burnish the bushing for correct size.

Re: SMALL BLOCK OIL PUMP DRIVE [Re: mopars4ever] #278945 04/06/09 06:54 AM 04/06/09 06:54 AM
Joined: Aug 2007 Posts: 316 Ohio L Lil Wedge OP enthusiast
Lil Wedge OP enthusiast L Joined: Aug 2007 Posts: 316 Ohio	If it was just the bushing,why would the shaft fall in with no resistance without the oil pump on the main. You can see the shaft is off center in the hole and as soon as you install the pump it binds the shaft like the bushing is cocked, but it is seated flush and this is the 3rd bushing and shaft I have tried. It acts like the block was machined wrong from the factory. Engine is built now,too late to do any maching,Any ideas would be appreciated.

Re: SMALL BLOCK OIL PUMP DRIVE [Re: Lil Wedge] #278946 04/06/09 08:26 AM 04/06/09 08:26 AM
Joined: Jan 2003 Posts: 9,982 Ansonia, CT C CJK440 master
CJK440 master C Joined: Jan 2003 Posts: 9,982 Ansonia, CT	Check to make sure that the pump body is sitting flat against the cap. I had the same issue and it turned out that the head of the main cap bolt was hitting the pump preventing it from fully seating. 2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"

Re: SMALL BLOCK OIL PUMP DRIVE [Re: CJK440] #278947 04/06/09 01:07 PM 04/06/09 01:07 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Check to make sure that the pump body is sitting flat against the cap. I had the same issue and it turned out that the head of the main cap bolt was hitting the pump preventing it from fully seating. As stated above and who's to say that if you stack up the tolerances that the bushing isnt pointed 1/2 degree off(or even less than a 1/2)... check the pump mount first

Re: SMALL BLOCK OIL PUMP DRIVE [Re: MR_P_BODY] #278948 04/06/09 06:50 PM 04/06/09 06:50 PM
Joined: Aug 2007 Posts: 316 Ohio L Lil Wedge OP enthusiast
Lil Wedge OP enthusiast L Joined: Aug 2007 Posts: 316 Ohio	The pump has clearance and will go on easy and flat with out oil pump shaft installed. The shaft is not centered in the main cap well , slightly closer towards crank side which makes everything in a bind. After champering the shaft slightly where it goes into the pump(about 1/4" up from tip)will that weaken the shaft enough to worry about, still has a good 1/2" of hex untouched in pump? 5147114-IMG00144.jpg (31 downloads)

Re: SMALL BLOCK OIL PUMP DRIVE [Re: Lil Wedge] #278949 04/06/09 06:55 PM 04/06/09 06:55 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: The pump has clearance and will go on easy and flat with out oil pump shaft installed. The shaft is not centered in the main cap well , slightly closer towards crank side which makes everything in a bind. After champering the shaft slightly where it goes into the pump(about 1/4" up from tip)will that weaken the shaft enough to worry about, still has a good 1/2" of hex untouched in pump? Just as long as you didnt get it real hot... the tip is hardened, if you didnt, it'll be fine. You can open the bushing slightly to take the side load off of it

Re: SMALL BLOCK OIL PUMP DRIVE [Re: MR_P_BODY] #278950 04/06/09 07:45 PM 04/06/09 07:45 PM
Joined: Aug 2007 Posts: 316 Ohio L Lil Wedge OP enthusiast
Lil Wedge OP enthusiast L Joined: Aug 2007 Posts: 316 Ohio	I hand filed it, hopefully it's all good cause it's goin together. This is something I meant to take care of while the block was at the machine shop and I forgot till I started going together. "Senality" Just another amazing skill I've developed over the last few years! Thanks for all the help!

Re: SMALL BLOCK OIL PUMP DRIVE [Re: Lil Wedge] #278951 04/06/09 08:21 PM 04/06/09 08:21 PM
Joined: Jan 2003 Posts: 5,991 Anoka County, MN L Leigh master
Leigh master L Joined: Jan 2003 Posts: 5,991 Anoka County, MN	Does the broach of the pump shaft fit the pump? Don't use a pump to cap gskt, and install the shaft before you tighten down the pump. I had a Melling pump that was made wrong in the early 90's, and it did the same thing. The original parts fit, right?

Re: SMALL BLOCK OIL PUMP DRIVE [Re: Leigh] #278952 04/06/09 08:32 PM 04/06/09 08:32 PM
Joined: Aug 2007 Posts: 316 Ohio L Lil Wedge OP enthusiast
Lil Wedge OP enthusiast L Joined: Aug 2007 Posts: 316 Ohio	I had this problem with 2 different Melling pumps, However I stand corrected, there is a clearance problem, just like you guys said to check, pump does hit main cap bolt very slightly without a gasket. Mains are studded and that bolt is washered. Even with a gasket it would still touch. File the bolt?

Re: SMALL BLOCK OIL PUMP DRIVE [Re: Lil Wedge] #278953 04/06/09 08:41 PM 04/06/09 08:41 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: I had this problem with 2 different Melling pumps, However I stand corrected, there is a clearance problem, just like you guys said to check, pump does hit main cap bolt very slightly without a gasket. Mains are studded and that bolt is washered. Even with a gasket it would still touch. File the bolt? You gotta get a touch of clearance between the bolt and pump(I dont use the gasket)

Re: SMALL BLOCK OIL PUMP DRIVE [Re: MR_P_BODY] #278954 04/07/09 07:55 AM 04/07/09 07:55 AM
Joined: Jan 2003 Posts: 9,982 Ansonia, CT C CJK440 master
CJK440 master C Joined: Jan 2003 Posts: 9,982 Ansonia, CT	Does the stud hit?? Most people run into problems with a stud in that location because its too long. Originally I ditched the stud and used a stock bolt. I had to grind a point of the stock bolt head because it hit the pump, new melling pumps must have more meat in the casting in that area. Most recently I cut down a stud and spot faced the main cap so I could use a stud and a nut. I used a 12 point nut but still had to grind the flange a bit to clear the pump body. 2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"

Re: SMALL BLOCK OIL PUMP DRIVE [Re: CJK440] #278955 04/07/09 08:57 AM 04/07/09 08:57 AM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	Mellings oil pump and ARP main studs on mine. The machine shop grinded the stud, used a 12 point nut and grinded that too, no washer, and the pump body was clearanced also. No oil pump gasket and it just barely clears.

Re: SMALL BLOCK OIL PUMP DRIVE [Re: 69Cuda340S] #278956 04/07/09 07:11 PM 04/07/09 07:11 PM
Joined: Aug 2007 Posts: 316 Ohio L Lil Wedge OP enthusiast
Lil Wedge OP enthusiast L Joined: Aug 2007 Posts: 316 Ohio	I ground the pump body and got .020 clearance, just hope I didn't weaken it too much, Pump had a hump in casting that hit the bolt head and I just flattened it out. In my other engine I used a cut off stud and 12 point and it worked well. When I said I had clearance I musta been thinking of that one. Thanks for all the help!!!

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