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Discussion Starter · #41 ·
Ok, Where can a person buy parts to rebuild their 4bd1t other than a dealer? I'm talking about gaskets, seals, bearings, oil pump, valves and other replaceable items! I am new at this Isuzu game and would like some options before I tear into mine!

Thanks !
You can find parts many places including eBay. But most aftermarket parts aren't good. For example I haven't found any aftermarket pistons and liners which are graded for fit.
 

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Discussion Starter · #44 · (Edited)
Cylinder Liners (4BD2, but same part for 4BD1 & T).

LINER; CYL BLK (1-11261-240-0)
OD Grade 1, ID Grade AX

LINER; CYL BLK (1-11261-241-0)
OD Grade 1, ID Grade CX

LINER; CYL BLK (1-11261-242-0)
OD Grade 2, ID Grade AX

LINER; CYL BLK (1-11261-243-0)
OD Grade 2, ID Grade CX

LINER; CYL BLK (1-11261-244-0)
OD Grade 3, ID Grade AX

LINER; CYL BLK (1-11261-245-0)
OD Grade 3, ID Grade CX

LINER; CYL BLK (1-11261-246-0) (This was mis-spelt 6INER in the description)
OD Grade 4, ID Grade AX

LINER; CYL BLK (1-11261-247-0)
OD Grade 4, ID Grade CX

All these part numbers from: https://www.isuzunprparts.com/produ...sAccessory=0&isPerformance=0&searchTerm=liner

Price for all was $US143.03 each

AX/CX refers to piston grades to match installed liners. Measure liners 20mm down and 105mm down with 4 points each (8 total). Average these values.
Pistons are measured diameters below oil ring but above gudgeon pin hole at 90 deg to gudgeon pin hole.
Grade A is 102.02-102.04mm Liner ID
Grade A is 101.955-101.974mm Piston OD
Grade C is 102-04-102.06mm Liner ID
Grade C is 101.975-101.994mm Piston OD

Obviously if you're outside these measurements you have a problem!

Grade 1-4 is the bore size based on 0.01-0.019mm interference between liner and block. Two methods are described in different manuals.
First is using one measuring point is 115mm down from the deck. Measure 4 points (X, Y and 2 diagonals) and average.
Second is using 3 heights (20, 105 and 195mm down) and taking two measurements at each height.
Measurements are averaged in each case.

Grade 1 105.001-105.010 Block ID 105.011-105.020 Liner OD
Grade 2 105.011-105.020 Block ID 105.021-105.030 Liner OD
Grade 3 105.021-105.030 Block ID 105.031-105.040 Liner OD
Grade 4 105.031-105.040 Block ID 105.041-105.050 Liner OD
 

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Discussion Starter · #45 · (Edited)
4BD2 Piston Rings. These are same fitment as 4BD1/T.

RING SET; PISTO (8-97117-686-0)

Set is per cylinder. Price listed on isuzunprparts.com is $US52.73

Also:

4BD1T Piston Rings from nkrdieselparts.com

P/N: 560-6215 (This is too short to be an Isuzu P/N).
$US39.60 per cylinder set: https://www.nkrdieselparts.com/part...ON_RING_4BD1-4BD1T-4BD2_(1_CYL)/5-12121-004-0

Piston Rings install with marked sides up on top ring, step down on mid ring.
 

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Discussion Starter · #46 ·
4BD1/T Pistons:

P/N 5-12111-242-1 or 8-97176-636-0

98mm total height.
3mm top groove
2.5mm second groove
5mm oil control groove

Can't find an official source or price. Just aftermarket.
 

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Discussion Starter · #47 · (Edited)
4BD1T Cylinder Liner Kits (liner, piston, rings) for 1980-1993 engines. Letters in model specific suggests they're one for all.

5-87814-625-0 Grade 1
5-87814-626-0 Grade 2
5-87814-627-0 Grade 3
5-87814-628-0 Grade 4

Also these but nothing showing in model specific applications:

5-87813-140-0 Grade 1
5-87813-141-0 Grade 2
5-87813-142-0 Grade 3
5-87813-143-0 Grade 4

hitachi-isuzu.com have those 5-87813 kits listed: http://www.hitachi-isuzu.com/NPR-4B...0-587813-1440-5-87813144-0-5-87813-144-0.html
 

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Discussion Starter · #49 ·
Oil pump part numbers from Bush65

Regarding the different oil pumps, according to my information:
All 4BD1T's for automotive use from late 1988 on (up to about 94, it did not change again for 89 on) have a gear type pump, part number 8943662410.
All 4BD1's & 4BD1T's for industrial use from 1980 on have a gear type pump, part number 5131001373.
4BD1's & 4BD1T's for automotive use from late 1985 to late 88 have a gerotor type pump part number 8941144911.

Also according to my information, the gear type pump used for all 4BD1T's for automotive use from late 1988 on provides 20% more displacement/flow than the gerotor type pump used from late 85 to late 88.

Because both the gear and gerotor type pumps are positive displacement types, neglecting internal bypass due to clearances (new or with wear), if the later gear type pump for automotive 4BD1T's has 20% more displacement, it should be 20% more across the entire rpm range.
 

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I am looking for the rpm sensor for a 4bd2t engine. 16mx1.0 threads. Magnetic pickup. Seems impossible to find. I have been searching the internet for hours. It mounts in front of the zexel fuel pump on the front timing case.
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I have just taken delivery of a genuine 4BD1 industrial parts catalogue, a breif flick through reveals about 3 different flywheels, 4 different sumps, 8 different bellhousings etc.

Thank you ebay.bounce

Ask me if you're looking for anything.
How about a 4BD2TC to the Aisan Warner automatic bellhousing? The Jatco hiccups get annoying and as easy to predict as earthquakes
 
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