Cummins/Onan — Remove and Install Turbocharger (VT8-430 Series)

Repair & overhaul

From a Cummins/Onan service manual covering: V12 Series, V6-140, V6-200, V6-VAL, V6-VIM, V8-185, V8-265, V8-350, V8-VALE, V8-VINE, VT12, VT8-430. Check it applies to your exact model before use.

Applies to: Cummins/Onan V12 Series

Procedure

1. Remove glow plug electric leads and fuel lines to preheater nozzles.
2. Remove aneroid control air line from left bank intake manifold connection.
3. Remove capscrews; rotate and remove air connections from both banks; discard O-rings.
4. Disconnect air cleaner-to-turbocharger connection at turbocharger air intake.
5. Remove connection from exhaust outlet of turbocharger.
6. Remove V-clamp rings attaching exhaust manifolds to turbocharger exhaust inlets.
7. Remove capscrews securing turbocharger to accessory support cover; lift off turbocharger and gaskets.
8. Installation: position new gasket and turbocharger on accessory support cover; secure finger tight.
9. Connect exhaust manifolds and secure with V-clamp rings.
10. Install exhaust outlet connection and air cleaner connection.
11. Install new O-rings on each air connection; secure to each rocker cover.
12. Tighten exhaust manifold capscrews to 30 foot-pounds and lock; tighten turbocharger capscrews to 30 foot-pounds.
13. Connect fuel lines to preheater nozzles and electric leads to glow plugs.
14. Reconnect aneroid control air line.

Full service-parts list: Cummins/Onan V12 Series →

Source: Cummins/Onan 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.

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