Toyota 13801-0P030 Arm Sub-Assembly, Valve

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This procedure requires engine and transaxle removal. Drain engine oil and coolant, then remove timing chains and sprockets. Ensure correct camshaft positioning before removal. Gradually remove bearing cap bolts, then housing bolts. Remove bearing caps and camshafts, and pry off camshaft housing. Remove and inspect rocker arms and lash adjusters. Check cam lobes and bearing journals for damage. Measure camshaft lobe and journal dimensions, replacing any outside specified limits. Check oil clearance for each camshaft journal, replacing if necessary. Lubricate and reinstall lash adjuster bores, rocker arms, camshafts, bearing caps, and housing. Apply RTV silicone sealer to sealing surfaces and tighten bolts. Repeat for front cylinder bank. Reinstall timing chains, cover, and components. Check for resistance by hand-rotating crankshaft. Refill oil and coolant, reconnect battery, start engine, and check for leaks.

Remove all rocker arms and lash adjusters and place them in a labeled box. Inspect each rocker and lash adjuster arm for wear.

Lightly lubricate the camshaft journals, install the camshafts with the locating pins in the 12 o'clock position, and proceed as with the right cylinder head.

Carefully pry the camshaft housing from the top of the cylinder head using a screwdriver wrapped with tape to avoid scratching the parts.

Do not rotate the crankshaft while the timing chains and camshafts are removed.