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jesse 
AMC Nut
Joined: Feb/22/2010
Location: Edinburg, Texas
Status: Offline
Points: 299
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 Topic: Oil Pump Gear Kit Installation
Posted: Dec/21/2016 at 12:29pm |
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My freshly built 68 390 Is experiencing very low oil pressure. I purchased a new Timing case from Bulltear and oil pump housing. The only thing I have not replaced are the oil pump gears. I have purchased the gear kit and I am replacing them this afternoon. Can this be done without removing the timing case cover? The kit says to just lube the gear in oil prior to installation but I saw a video where a gentleman covers the gears in grease. Any tips on this would be greatly appreciated, thanks in advance. BTW the break in oil (compcam oil) was just replaced yesterday with 5 qts Penzzoil 10W-40 and a bottle of Lucas ZDDP. Oil pressure is at 40 cold and hot at 0 in gear.
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401MATCOUPE
AMC Addicted
Joined: May/20/2010
Location: Salisbury, MD
Status: Offline
Points: 5367
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Posted: Dec/21/2016 at 1:06pm |
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Yes, just remove the 7/16" head bolts that hold on the Oil Filter Adapter, the gears will want to fall out.....put the next gears back in, new gasket, I would recommend priming engine oil pump before you start it "dry" in the oil pump.
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar)
68X,GoPac,390,4sp,52A
69X,GoPac,390,4sp,64A
70X,GoPac,390,4sp,87A,8
70X,GoPac,390,4sp,BBO,8
70 Jav SST,390,AT,BSO
74MatX,401,AT,Prototype
74MatX,401,AT
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1970390amx
AMC Addicted
Joined: Jul/11/2008
Location: colorado
Status: Offline
Points: 3314
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Posted: Dec/21/2016 at 1:36pm |
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Pump gear end play is somewhat critical, the gears should stick out of the housing a few thousands of an inch. There is more than one thickness of gasket, to thick of gasket can cause problems. There are sveral threads on this forum on low oil pressure yo can search for. While you have the end plate off make sure the oil relief valve is moving freely. I use Vaseline to pack the pump gear cavity. But pulling the distributor and pre oiling the motor would be better.
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1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box
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Rogue401
AMC Addicted
Joined: Nov/26/2010
Location: New York
Status: Offline
Points: 1280
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Posted: Dec/21/2016 at 1:41pm |
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x2. TSM I have says Vaseline, probably because it just makes it easy to prime the pump and then just disappears.
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401MATCOUPE
AMC Addicted
Joined: May/20/2010
Location: Salisbury, MD
Status: Offline
Points: 5367
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Posted: Dec/21/2016 at 2:35pm |
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Glad to hear someone else uses Vaseline, last time I brought that up, you would have thought I said to used Valve Grind Compound!! It is what the TSM says and what I have always used.
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar)
68X,GoPac,390,4sp,52A
69X,GoPac,390,4sp,64A
70X,GoPac,390,4sp,87A,8
70X,GoPac,390,4sp,BBO,8
70 Jav SST,390,AT,BSO
74MatX,401,AT,Prototype
74MatX,401,AT
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jesse
AMC Nut
Joined: Feb/22/2010
Location: Edinburg, Texas
Status: Offline
Points: 299
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Posted: Dec/21/2016 at 3:04pm |
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I will post my results after installation. Hope this clears my low oil pressure issue. I would hate to spin a bearing after rebuilding this 390.
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one bad rambler
AMC Addicted
Joined: Jan/09/2008
Location: On The Island
Status: Offline
Points: 2007
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Posted: Dec/21/2016 at 4:30pm |
 401MATCOUPE wrote:
Glad to hear someone else uses Vaseline, last time I brought that up, you would have thought I said to used Valve Grind Compound!! It is what the TSM says and what I have always used. |
...It`s funny i`ve been using vaseline for over 30 years...I still don’t see the problem...First of all it dissolves into the oil...second if people think a table spoon of petroleum jelly is going to compromise 5 to 8 quarts of oil i would have to disagree... i need proof....
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 68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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Rebel Machine
AMC Addicted
Joined: Jul/03/2007
Location: Western Il
Status: Offline
Points: 5121
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Posted: Dec/21/2016 at 5:01pm |
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You said it was a fresh rebuild. Don't suppose you have the main and rod bearing clearance measurements.
-Steve-
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iapexl8r
AMC Addicted
Joined: Apr/13/2008
Location: north idaho
Status: Offline
Points: 639
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Posted: Dec/21/2016 at 5:30pm |
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I have been an aircraft mechanic for over 20 years an I can tell you vasoline is used on alot of stuff involved with engine oil as well as skydrol and 5606. It is the safest bet.
Who built this motor?
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jesse
AMC Nut
Joined: Feb/22/2010
Location: Edinburg, Texas
Status: Offline
Points: 299
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Posted: Dec/21/2016 at 7:02pm |
Main and Rod bearings are standard size since thats what came off during the rebuild and crank and rods have not been machined. Unfortunately i replaced the oil pump gear kit with same results. I noticed marks on the oil pump end cap as seen on the pic provided. 
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Oil Pump Gear Kit Installation