Some of the 850/S70 intake valve stem seals would leak. Does it smoke only when first started.
Oil from intake valve stem would leak into the valve after shutting off the engine overnight.
In the AM, the dripped in oil would smoke and burn off, not a lot of smoke.
If the exhaust smokes all the time, it is probably not intake stem seals.
A blocked up pcv could cause smoking. If it smokes like a bug fogger big time, the oil seals in the turbo could have failed. Engine oil pressure in the turbo shaft housing is leaking past the metal shaft seals.
Oil pressure is being forced/sucked into the exhaust, smoking, burning out the tail pipe.
Remove the intake hose at the turbo inlet. Look in with a mirror for oil-soaked fins. Reach in and move the turbo inlet shaft up/down. 1/16″ to maybe 1/8″ play up/down is normal. Turbo shaft has a bronze type bushing. Engine oil pressure is forced around the bronze bushing. Pressurized engine oil going around the bronze bushing is the bearing and lubrication. A regular bearing would burn up and come apart at 10K-20K rpms. Look at the parts list and PDF cylinder head remove directions.
Stop at removing cam section. There are not any directions for valve stem seal replacement. Do not mix up, the solid lifters, they are all a different thickness for valve adjustment. Put the piston at TDC. Connect a compression hose to that cylinder, remove hose Shrader valve. Put 150 psi shop air into the piston. This will hold the valves closed. Remove valve spring and keeper, replace valves stem seal, repeat. Put it all back together.
Cylinder head 5CYL,Supplied without camshaft and valve lifter., B5234T3 Print
Fig. Description Qty. PS Part number
1 Cylinder head, exch 1.00 EU 8251136
-2004 EXC B5254T2
Cylinder head, exch 1.00 EU 8602635
B5254T2
2 Inlet valve, intake 10.00 9454607
Exhaust valve, exhaust 10.00 9454610
3 Valve spring washer, lower 20.00 3531102
4 Valve seal, intake 10.00 9443787
Valve seal, exhaust 10.00 31316151
5 Valve spring 20.00 31359507
6 Valve spring washer, upper 20.00 9454612
7 Valve cotter 40.00 9454613
8 Flange screw 42.00 985135
CH -424999
Flange screw 45.00 985135
(975883), CH 425000-
9 Cap plug 1.00 946780
10 Cap plug 1.00 946778
11 Cap plug 1.00 946779
12 Cap 1.00 1361451
13 Locating pin 5.00 1397500
14 Sealing ring, intake, without, VVT 1.00 9440651
15 Pulley, intake, without, VVT 1.00 3531523
16 Flange screw 3.00 982778
17 Plug 1.00 1275364
18 O-ring 1.00 NS
19 Six point socket screw 1.00 980734
20 Flange screw 3.00 982758
21 Pulley, exhaust, with, VVT 1.00 9180721
22 Pulley, exhaust, with, VVT 1.00 1275363
CH -170999
Pulley, exhaust, with, VVT 1.00 9497786
CH 171000-
23 Sealing ring, exhaust, with, VVT 1.00 9458309
24 Gasket 1.00 9443896
B5204T5 B5234T3/T7, B5244T4/T5
Gasket 1.00 9404726
B5244T3
Gasket 1.00 30637336
B5254T2, ENG -2979610
Gasket 1.00 30637066
B5254T2, ENG 2979611-
25 Screw 12.00 6842347
26 Sealing ring 1.00 9443310
VVT
27 Cap 2.00 1397381
28 Cover 1.00 1270363
29 Six point socket screw 6.00 986009
30 Filler cap 1.00 8692888
31 Gasket 1.00 1275379
32 Flange screw 4.00 982758
33 Solenoid, exchange, exhaust 1.00 EU 36002695
CH -170999
Solenoid, exchange, exhaust 1.00 EU 36002686
CH 171000-
34 Gasket 1.00 30731212
35 Camshaft, intake 1.00 9207941
-2001 B5204T5
Camshaft, intake 1.00 6900043
2002-2004 B5204T5
Camshaft, intake 1.00 9207943
-2001 B5234T3/T7
Camshaft, intake 1.00 6900044
2002- B5234T3/T7
Camshaft, intake 1.00 9497823
B5244T3
Camshaft, intake 1.00 8670354
B5254T2
Camshaft, exhaust 1.00 9207944
-2001 EXC B5244T3
Camshaft, exhaust 1.00 9497822
2002-2004 EXC B5244T3
Camshaft, exhaust 1.00 8642712
CH 425000-
Camshaft, exhaust 1.00 9497822
B5244T3
Camshaft, exhaust 1.00 8642712
B5254T2 B5244T4/T5
36 Valve tappet, kit 1.00 8641012
Replacement parts may differ from production parts.
37 Valve tappet 1.00 1298596
THK=15.96 mm
Replacement parts may differ from production parts.
Valve tappet 2.00 1298598
THK=15.98 mm
Replacement parts may differ from production parts.
Valve tappet 2.00 1298600
THK=16.00 mm
Replacement parts may differ from production parts.
Valve tappet 3.00 1298602
THK=16.02 mm
Replacement parts may differ from production parts.
Valve tappet 3.00 1298604
THK=16.04 mm
Replacement parts may differ from production parts.
Valve tappet 5.00 1298606
THK=16.06 mm
Replacement parts may differ from production parts.
Valve tappet 3.00 1298608
THK=16.08 mm
Replacement parts may differ from production parts.
Valve tappet 3.00 1298610
THK=16.10 mm
Replacement parts may differ from production parts.
Valve tappet 2.00 1298612
THK=16.12 mm
Replacement parts may differ from production parts.
Valve tappet 2.00 1298614
THK=16.14 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298616
THK=16.16 mm
Replacement parts may differ from production parts.
38 Valve tappet
Valve tappet 1.00 1298586
THK=15.86 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298588
THK=15.88 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298590
THK=15.90 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298592
THK=15.92 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298594
THK=15.94 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298618
THK=16.18 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298620
THK=16.20 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298622
THK=16.22 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298624
THK=16.24 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298626
THK=16.26 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298628
THK=16.28 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298630
THK=16.30 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298632
THK=16.32 mm
Replacement parts may differ from production parts.
Valve tappet 1.00 1298634
THK=16.34 mm
Replacement parts may differ from production parts.
40 Plug 20.00 30713158
2000-, ENG -2872729., EXC BI-FUEL
Plug 20.00 30713158
ENG 2872730-
41 Sealing ring 5.00 1397525
44 Sleeve 12.00 9139539