Ski

Does the block have a sleeve in it IN the OPRV hole?

Ski

I think, now think is the key word that you CAN get an 86 OPRV in the 87 hole but you can't get an 87 in the 86 sleeve. The tensioner could have been installed, it's fairly easy to do with the engine out - the key is if the engine has the sleeve in it at the OPRV and the only way to do that is remove the housing.

Let me check the spares locker in the garage see if I have an 87 new or used one out there
You can add a quart of oil (don't drive it) to the pan and see what happens to the pressure - if it stays good, then something is wrong with the pick up, the seal, or the worst case is the girdle didn't get enough sealant on it and air is getting in the oil galley. Drain the quart if the pressure was good and see what happens.

Chris White

It sounds like a sticky OPRV. Especially since it’s a fresh rebuild – any ‘stuff’ that was in the engine has to pass by the oil pressure relief valve. Any little debris can cause the piston to hang up. Push on the piston to make sure that it can move in and out freely with out hanging up.

Charlie

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.01 4 2479 163 82 944 41C 0001-5000 82
M44.01 4 2479 163 83 944 41D 0001-E999 83
M44.01 4 2479 163 84 944 41E 00001-20000 84
M44.01 4 2479 163 85 944 41F 40001-50000 85

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.02 4 2479 150 83 944 (USA) (CAN) (J) 43D 0001-J999 83
M44.02 4 2479 150 84 944 (USA) (CAN) (J) 43E 00001-20000 84
M44.02 4 2479 150 85 944 (USA) (CAN) (J) 43F 40001-50000 85

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.03 4 2479 163 82 944 Automatik 41C 5001-8000 82
M44.03 4 2479 163 83 944 Automatik 41D 5001-9999 83
M44.03 4 2479 163 84 944 Automatik 41E 20001-30000 84
M44.03 4 2479 163 85 944 Automatik 41F 50001-60000 85

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.04 4 2479 150 83 944 Automatik (USA) (CAN) (J) 43D 5001-9999 82/83
M44.04 4 2479 150 84 944 Automatik (USA) (CAN) (J) 43E 20001-30000 84
M44.04 4 2479 150 85 944 Automatik (USA) (CAN) (J) 43F 50001-60000 85

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.05 4 2479 163 85 944 41F 00001-20000 85
M44.05 4 2479 163 86 944 41G 00001-20000 86
M44.05 4 2479 163 87 944 41H 00001-20000 87

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.06 4 2479 163 85 944 Automatik 41F 20001-30000 85
M44.06 4 2479 163 86 944 bleifrei 41G 20001-30000 86
M44.06 4 2479 163 87 944 Automatik 41H 20001-30000 87

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.07 4 2479 150 85 944 43F 00001-20000 85
M44.07 4 2479 150 86 944 bleifrei 43G 00001-60000 86
M44.07 4 2479 150 87 944 bleifrei 43H 00001-60000 87
M44.07 4 2479 150 86 924 S 43G 00001-60000 87
M44.07 4 2479 150 87 924 S 43H 00001-60000 87

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.08 4 2479 150 85 944 Automatik 43F 20001-30000 85
M44.08 4 2479 150 86 944 Automatik bleifrei 43G 60001-90000 86
M44.08 4 2479 150 87 944 Automatik bleifrei 43H 60001-90000 87
M44.08 4 2479 150 86 924 S 43G 60001-90000 86
M44.08 4 2479 150 87 924 S 43H 60001-90000 87

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.09 4 2479 160 88 944 46J 00001-60000 87
M44.09 4 2479 160 88 924 S 46J 00001-60000 88

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.10 4 2479 160 88 944 Automatik 46J 60001-70000 87
M44.10 4 2479 160 88 924 S 46J 60001-70000 88

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.11 4 2681 165 89 944 46K 00001-60000 89

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.12 4 2681 165 89 944 Automatik 46K 60001-90000 89

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.40 4 2479 190 87 944 S 42H 00001-50000 87
M44.40 4 2479 190 88 944 S 42J 00001-50000 87

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.41 4 2990 211 89 944 S2 42K 00001-50000 89
M44.41 4 2990 211 90 944 S2 42L 00001-50000 90
M44.41 4 2990 211 91 944 S2 42M 00001-50000 91

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.43 4 2990 240 92 968 42N 00501-20000 92
M44.43 4 2990 240 93 968 42P 00501-20000 93
M44.43 4 2990 240 94 968 42R 00501-20000 94
M44.43 4 2990 240 95 968 42S 00501-20000 95

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.43 4 2990 240 92 968 Automatic 42N 50501-60000 92
M44.43 4 2990 240 93 968 Automatic 42P 50501-60000 93
M44.43 4 2990 240 94 968 Automatic 42R 50501-60000 94
M44.43 4 2990 240 95 968 Automatic 42S 50501-60000 95

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.50 4 2479 220 86 944 Turbo 44G 00001-00400 86

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.51 4 2479 220 86 944 Turbo 45G 00001-20000 86
M44.51 4 2479 220 87 944 Turbo 45H 00001-10000 87
M44.51 4 2479 220 88 944 Turbo 45J 00001-10000 87

Motorcode Zyl Ltr PS Mod.Jahr Modell Motornummer Einbau Jahr
M44.52 4 2479 250 88 944 Turbo S 47J 00061-10000 87
M44.52 4 2479 250 89 944 Turbo 47K 00001-10000 89
M44.52 4 2479 250 90 944 Turbo 47L 00001-10000 90
M44.52 4 2479 250 91 944 Turbo 47M 00001-01000 91


If the OPRV does not form a decent seal or is stuck open the oil pump cannot pull oil from the pan. I went through this on an engine a few years ago. The piston retaining clip inside the OPRV had someway moved down about 1/8 of an inch and the piston would not move upward enough to seal. So I would definitely make sure the OPRV is the correct one and sealing properly.

Van

That, Charlie, is an excellent reference! I'll look tomorrow.

Ski

nope, have an 86 new one pc design in the box. 1986 replacement on top, 87+ on the bottom.

Van

Thanks for looking. '86 one-piece is what's in there now.

VOoDOoGTX

leave somthing broken in vans garage and you can guarantee that by the next morning he will have figured it out(and usually tell me what i did to break it). Thanks Van!

sebastian944

what is a symptom of a bad OPRV?

Van

It's an '87 block with an '86 OPRV... Symptoms were fluctuating oil pressure and after a few starts, no oil pressure at all.

Once we get the right OPRV in there I'll let you know if it's fixed.

Charlie

I believe the OPRV on the left is the early one piece and the one on the right is the 87 and later. The 87+ is longer than the earlier ones.

951Saga

Is the o-ring 43A necessary?