Arrangement of camshaft bearing caps in order
1. Intake valve shaft covers
2. Exhaust valve shaft covers
3. Front of the engine
4. Rear of the engine
The front head shaft covers are marked with letters, and the rear head shaft covers are marked with numbers.
Sequence for loosening the camshaft bearing cap bolts (front cylinder head)
1. Timing belt side
Sequence for loosening the camshaft bearing cap bolts (rear cylinder head)
1. Timing belt side
Removal
1. Remove the cylinder head covers, timing belt and camshaft sprockets. If you are removing the camshafts from the front cylinder head, remove the distributor (1997 and earlier models). If you are removing the camshafts from the rear head, remove the intake manifold.
Content based on information from www.mazbook.ru
Caution! Before removing the camshaft bearing caps, align the camshaft dowel pins with the marks on the end caps.
2. On the front cylinder head, align the exhaust camshaft timing pin (A) with the mark on the end cap (B) and the timing mark on the camshaft sprocket (C).
3. On the rear cylinder head, align the dowel pin (A) of the intake camshaft with the mark on the end cap (B).
4. Loosen the shaft end cap bolts in several steps (1/4 turn each). Loosen the two external bolts first, and then the two internal ones (there is also a bolt (B) in the rear head that needs to be loosened last.
5. Remove the camshaft oil seals.
6. Using the given sequence, loosen in several steps (1/4 turn each) camshaft bearing cap bolts (see figure Sequence of loosening camshaft bearing cap bolts (front cylinder head) and the figure Sequence of loosening the camshaft bearing cap bolts (rear cylinder head)).
7. Remove the covers and camshafts.
8. Place the bearing caps in order.
Caution: If necessary, remove the valve lifters using a magnet. Place the pushers in order. Hydraulic tappets (1997 and earlier models) should be kept upside down in clean motor oil.
Examination
Inspect the camshafts and tappets (see subsection 3.1.10).
Camshaft Bearing Cap Bolt Tightening Sequence (front cylinder head)
Camshaft Bearing Cap Bolt Tightening Sequence (rear cylinder head)
Installation
1. Apply molybdenum grease to the lifters and install them in place.
2. Apply molybdenum grease to the camshaft lobes and bearing journals.
3. Install the shafts into the head and align the timing marks of the shaft gears.
4. Apply sealant to the outer edges of the front shaft bearing caps.
5. Align the timing pins of the drive shafts with the timing marks and install the camshaft thrust plates by tightening their bolts (see above).
6. Install all shaft bearing caps.
7. Using the given sequence, tighten in several steps (1/4 turn each) cover bolts (see figure Sequence of tightening the camshaft bearing cover bolts (front cylinder head) and figure Sequence of tightening the camshaft bearing cap bolts (rear cylinder head)).
8. Lubricate the new camshaft oil seal with engine oil and install it in place.
9. Install the caps, lubricated with sealant, onto the front parts of the driven camshafts.
10. Install the remaining parts in reverse order.