Thread Repair Specifications. Chevrolet TrailBlazer

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2006 🢒 TrailBlazer - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.2L 🢒 Thread Repair Specifications

Table 1:	Engine Block - Top View
Table 2:	Engine Block - Bottom View
Table 3:	Engine Block - Left Side View
Table 4:	Engine Block - Right Side View
Table 5:	Engine Block - Front View
Table 6:	Engine Block - Rear View
Table 7:	Cylinder Head - Top View
Table 8:	Cylinder Head - End View (Front)
Table 9:	Cylinder Head - End View (Rear)
Table 10:	Cylinder Head - Intake Manifold Deck View
Table 11:	Cylinder Head - Exhaust Manifold Deck View
Table 12:	Oil Pan - Top View
Table 13:	Oil Pan - Left Side View
Table 14:	Oil Pan - Right Side View
Table 15:	Oil Pan - Rear View
Table 16:	Engine Front Cover
Table 17:	Crankshaft Rear Oil Seal Housing

Engine Block - Top View

Engine Block - Top View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 11 x 2	402	n/a	n/a	403	404	108	59	2.324	51	2.009
2	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
3	M 6 x 1	201	202	n/a	203	204	205	30	1.182	26	1.024

Engine Block - Bottom View

Engine Block - Bottom View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985
2	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773
3	20 x 16	n/a	n/a	n/a	n/a	n/a	n/a	33	1.300	23	0.906

Engine Block - Left Side View

Engine Block - Left Side View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
2	M 24 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	30	1.182	20	0.788
3	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
4	M 12 x 1.75	856	857	n/a	858	859	416	33	1.3	17	0.669
5	M 6 x 1	201	202	n/a	203	204	205	25	0.985	20	0.788
6	M 8 x 1.25	206	207	n/a	208	209	210	25	0.985	20	0.788
7	M 28 x 1.25	n/a	n/a	n/a	n/a	n/a	n/a	25	0.985	17	0.669
8	M 6 x 1	201	202	n/a	203	204	205	19	0.748	15	0.591
9	M 10 x 1.5	211	212	n/a	213	214	420	25	0.985	20	0.788
10	M 8 x 1.25	206	207	n/a	208	209	210	19	0.748	15	0.591
11	M 8 x 1.25	206	207	n/a	208	209	210	33	1.3	27	1.063

Engine Block - Right Side View

Engine Block - Right Side View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	16 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	32	1.260	23	0.906
2	16 x 1.5	211	212	n/a	213	214	420	32	1.260	23	0.906
3	16 x 1.5	206	207	n/a	208	209	210	32	1.260	23	0.906
4	10 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	33	1.300	27	1.063
5	10 x 1.5	211	212	n/a	213	214	420	33	1.300	27	1.063
6	16 x 2	211	212	n/a	213	214	420	24	0.945	16	0.630
7	10 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	29	1.142	26	1.024
8	8 x 1.25	211	212	n/a	213	214	420	23	0.906	18	0.709

Engine Block - Front View

Engine Block - Front View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	6 x 1	405	n/a	407	203	204	205	30	1.182	26	1.024
2	6 x 1	201	202	n/a	203	204	205	18	0.709	14	0.551
3	6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
4	6 x 1	201	202	n/a	203	204	205	30	1.182	26	1.024
5	16 x 1.5	405	n/a	407	203	204	205	24	0.945	16	0.630
6	8 x 1.25	206	207	n/a	208	209	210	30	1.182	25	0.985

Engine Block - Rear View

Engine Block - Rear View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	16 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	24	0.945	16	0.630
2	10 x 1.5	211	212	n/a	213	214	420	39	1.536	33	1.300
3	6 x 1	201	202	n/a	203	204	205	20	0.788	16	0.630
4	10 x 1.5	211	212	n/a	213	214	215	57	2.245	54	2.127

Cylinder Head - Top View

Cylinder Head - Top View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 6 x 1	405	n/a	406	203	204	205	28	1.103	24	0.945
2	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
3	M 6 x 1	405	n/a	407	203	204	205	THRU		THRU

Cylinder Head - End View (Front)

Cylinder Head - End View (Front)

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 10 x 1.5	211	212	n/a	213	214	215	28	1.103	22	0.866
2	M 8 x 1.25	206	207	n/a	208	209	210	28	1.103	23	0.906
3	M 24 x 1.5	n/a	n/a	n/a	n/a	n/a	n/a	THRU		THRU
4	M 6 x 1	201	202	n/a	203	204	205	28	1.103	23	0.906

Cylinder Head - End View (Rear)

Cylinder Head - End View (Rear)

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 14 x 1.5	409	410	n/a	411	412	413	36	1.418	28	1.103
2	M 10 x 1.5	211	212	n/a	213	214	215	28	1.103	22	0.866

Cylinder Head - Intake Manifold Deck View

Cylinder Head - Intake Manifold Deck View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 10 x 1.5	211	212	n/a	213	214	420	33	1.3	27	1.063
2	M 10 x 1.5	211	212	n/a	213	214	215	28	1.103	22	0.866
3	M 6 x 1	201	202	n/a	203	204	205	23	0.906	18	0.709

Cylinder Head - Exhaust Manifold Deck View

Cylinder Head - Exhaust Manifold Deck View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	8 x 1.25	206	207	n/a	208	209	210	28	1.103	23	0.906
2	6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709
3	6 x 1	405	n/a	406	203	204	205	28	1.103	23	0.906
4	10 x 1.5	417	n/a	n/a	418	419	420	53	2.088	45	1.773

Oil Pan - Top View

Oil Pan - Top View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 8 x 1.25	206	207	n/a	208	209	415	THRU		THRU
2	M 12 x 1.75	856	857	n/a	858	859	416	THRU		THRU

Oil Pan - Left Side View

Oil Pan - Left Side View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 10 x 1.5	211	212	n/a	213	214	420	40	1.576	25	0.985
2	M 10 x 1.5	856	857	n/a	858	859	855	42	1.654	25	0.985

Oil Pan - Right Side View

Oil Pan - Right Side View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 10 x 1.5	211	212	n/a	213	214	420	42	1.654	25	0.985

Oil Pan - Rear View

Oil Pan - Rear View

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 10 x 1.5	211	212	n/a	213	214	215	THRU		THRU

Engine Front Cover

Engine Front Cover

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 6 x 1	n/a	n/a	n/a	n/a	n/a	n/a	30	1.182	26	1.024
2	M 6 x 1	201	202	n/a	203	204	205	16.5	0.65	13	0.512
3	M 6 x 1	201	202	n/a	203	204	205	THRU		THRU
4	M 6 x 1	201	202	n/a	203	204	205	17	0.669	14	0.551

Crankshaft Rear Oil Seal Housing

Crankshaft Rear Oil Seal Housing

Service Hole Location	Thread Size	Drill	Counterbore Tool	Stop Collar	Tap	Driver	Insert	Drill Depth (Max)		Tap Depth (Min)
J 42385-400								mm	(in)	mm	(in)
1	M 6 x 1	201	202	n/a	203	204	205	22	0.866	18	0.709