• The Roadster Factory Recovery Fund - Friends, as you may have heard, The Roadster Factory, a respected British Car Parts business in PA, suffered a total loss in a fire on Christmas Day. Read about it, discuss or ask questions >> HERE. The Triumph Register of America is sponsoring a fund raiser to help TRF get back on their feet. If you can help, vist >> their GoFundMe page.
  • Hey there Guest!
    If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.
    **Upgrade Now**
    (PS: Subscribers don't see this UGLY banner)
Tips
Tips

TR2/3/3A Oil pump rebuild

BobbyO

Jedi Hopeful
Country flag
Offline
When rebuilding or checking a TR3 oil pump the maintenance manual states the end float between the rotors and the end plate should be 0.0005" to 0.0025". How do you make this measurement? I would think you'd remove the end plate, turn the pump upside down and check any clearance between the rotors and bottom of the upper portion of the pump. Is this correct? On my car, most of the time the oil pressure is 70 psi; however, after the engine becomes hot (not overheating) it may drop to between 50 and 70 at speed and as low as 20-25 psi at idle making me think the end float on the oil pump may be excessive.
 

CJD

Yoda
Country flag
Offline
Several ways, depending on the tools you have at hand. I mic the rotor and mic the case to find the difference. You could also use a dial indicator on the drive shaft and pull the shaft up and down within the pump assembly with the cover on. Then, you could use a feeler gage on the edge of a flat plate with the cover off and pump upside down. You could use plastigage on the impellers and seal the case up to check.

I am sure there are other ways!?!

Your pressure sounds good to me, by the way...at least way better than I would be concerned with. Loss of pressure is normally a result of bearing wear. Bearing wear usually occurs much faster than end wear on the pump impellers.
 
OP
B

BobbyO

Jedi Hopeful
Country flag
Offline
Thanks John. With all those ways to check the end float, I have the tools necessary to accomplish at least two of them, maybe three. Anyway, I'm rebuilding a spare oil pump and needed to determine how to accurate check the end float.

The engine has only a little over 3000 miles on it. The PO rebuilt the bottom half before I got it so I presume he used new bearings and did something to the crank. I hope. And I don't know what was done with the pump. As long as the pressures stay good I'll stick with what I have.
 

TR3driver

Great Pumpkin - R.I.P
Offline
I lay a good straight edge across the end, and use feeler gauges to check the clearance between the straight edge and the rotor. Also feeler gauges to check clearance between inner and outer rotors.

If you do replace the pump, be sure the new one has a pin to hold the rotor to the shaft. Some of the cheap aftermarket pumps used a soft rotor and a knurled shaft, which don't hold up in use.

20-25 at hot idle isn't bad at all; but I would expect better than that from an engine with only 3k miles. Can't hurt to check while it's apart. Also check cam bearings, and the bushing that the oil pump drive shaft rides in.
 

sp53

Yoda
Country flag
Offline
I gotta tell you I have about 5 or 6 oil gauges and they are all a little different and one of them when the engine is good and warm it reads zero oil pressure at idle!!!!, but 70 at start up and about 45 at idle until it just fell away. That was a very unsettling day because the motor had about 1K on it. I preplaced it with a different gauge and had 50 at idle and 70 going down the road. I would purchase a new mechanical gauge and run that for a while until I messed around rebuilding the oil pump. Oil pumps often have an easy life and if they did not it really shows with scars, IMHO.
 
Similar threads
Thread starter Title Forum Replies Date
richberman Anyone rebuild oil pump gears Austin Healey 1
KVH General Tech Oil Pump Woodruff Key Triumph 10
KVH General Tech Gaskets—Head/Oil Pump Triumph 4
S For Sale Oil Pump Rotor Assembly for Sale Triumph Classifieds 0
B General MG 1275 Midget CamShaft Slot / Star drive to Oil Pump MG 2
A T-Series MGTD oil pump bypass valve MG 0
MikeAH100M Oil Pump for BN2 Austin Healey 4
A T-Series Mgtd oil pump alterations MG 2
nichola TR6 Oil pump drive barely engages Triumph 2
S TR6 After I put in my new oil pump.... Triumph 3
S T-Series oil pump MG 0
svtmikey GT6 Oil Pump replacement Triumph 5
D TR2/3/3A Oil pump question Triumph 31
J TR2/3/3A Oil Pump Wear Triumph 5
H For Sale Healey oil pump drive Austin Healey Classifieds 0
Michael Oritt 100 Oil Pump--options and resources Austin Healey 12
Michael Oritt 100 oil pump Austin Healey 5
J Bj8 Oil Pump Austin Healey 2
J 3000 bj8 Oil Pump Austin Healey 38
Jim_Gruber Priming oil pump Spridgets 9
JPSmit Question One - oil pump Spridgets 2
F Video showing oil pump and Kingpin bushing repacement on BJ8 Austin Healey 3
JPSmit New Oil Pump startup Spridgets 8
Rut 1275 oil pump, camshaft adapter Spridgets 2
KVH TR4/4A Using Drill to Spin Oil Pump Shaft Triumph 10
gbtr6 TR6 Prime oil pump in rebuilt engine... Triumph 10
T TR2/3/3A Oil Pump Grief Triumph 8
D Not another oil pump question. Austin Healey 7
tinman58 TR5/TR250 OIL PUMP Priming Triumph 3
B Overdrive Oil Pump Installation Question Austin Healey 10
J Denis Welch Aluminum Sump and H/C Oil Pump clearance Austin Healey 18
dcoplan I've got a twisted camshaft-to-oil pump pin. How to fix?? Spridgets 1
BOBBYR oil pump choice Austin Healey 5
RJS TR4/4A Oil leak at/on fuel pump Triumph 7
D Wedge Funny oil pump Triumph 9
johnrip Wedge TR7 Oil Pump Leak Triumph 2
JPSmit Oil Pump Question Spridgets 13
B TR2/3/3A oil pump drive shaft removal challenge on TR3 Triumph 14
Patrick67BJ8 Oil Pump Recommendation[s] for BJ8 Austin Healey 12
M Healey 100-4 Oil Pump Condition Check Austin Healey 3
BillW103 Oil Pump Spridgets 24
TulsaFred Oil pump priming access Spridgets 8
johnrip Wedge tr7 oil pump leak Triumph 2
B Oil Pump for 100-4 Austin Healey 2
chrpark MOWOG oil pump cover- attachment to back plate? Spridgets 6
richberman Which oil pump? Austin Healey 1
DNK Oil Pump spin up Question Triumph 18
P T-Series Looking for TD Oil Pump Top/Cap MG 0
johnrip Wedge TR7 oil pump Triumph 2
bill_powell Oil Pump Failure? Spridgets 14

Similar threads

Top