Detroit Diesel — Assembly of Cylinder Block (12V and 16V Engines)
Repair & overhaul
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Do not slide the faces against each other; may dislodge or twist the block seal strip.
- Do not use socket J 25451-4A when torquing B bolts.
Procedure
- Lift block with chain hoist; place with seal strip groove facing up.
- Apply Lubriplate to seal strip and seal ring grooves; install new seal strip.
- Place two new seal rings in the seal ring grooves.
- Place one new seal ring in the main oil gallery seal ring groove.
- Apply Lubriplate to the seal strip flat surface and remove excess.
- Mount the cylinder block on the overhaul stand.
- Stamp serial, model and position numbers if a new service block is used.
- Apply non-hardening sealant to plug and drain cock threads; install plugs and drain cocks.
- Install and tighten 2 1/2 in.-16 plugs to 312-366 N·m using J 23019.
- Install subassemblies and parts on the block.
- Position front block over rear block; do not slide faces against each other.
- Lower front block and align using tool J 21799 and dial indicator.
- Tighten C, D and E bolts and A bolt nut to specified torque; check alignment.
- Cut excess seal strip flush, remove alignment tool.
- Install B bolts, tighten to 325-339 N·m using wrench J 25451-7.
Tools required
- Chain hoist Amazon
- Cylinder block alignment tool J 21799 Amazon
- Plug installer J 23019 Amazon
- Wrench J 25451-7 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- J 21799 alignment: mismatched bottom faces within 0.05 mm (0.002 in.)
- C/D/E bolts 217-231 N·m (160-170 lb·ft)
- A bolt nut 224-238 N·m (160-175 KuduParts $38.00 lb·ft)
- B bolts 325-339 N·m (240-250 FridayParts $123.75 lb·ft)
- 2 1/2 in.-16 plugs 312-366 N·m (230-270 lb·ft)
Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.