58 4 DLT ENGINE 4. Heat the vessel and measure the water temperature with proper thermometer. 5. Note down the temperature when dial gauge needles starts moving indicating valve opening. 6. Theopening temperatureand fully open temperature measured should be as mentioned in repair data. If they do not meet the specifications, replace the thermostat element. INSPECTION OF TIMING BELT Check belt in detail. If following flaws are evident, replace belt with new one. - Back surface glossy, non elastic and so hard that even if finger nail is forced into it, no mark is produced. - Cracked back surface rubber - Cracked or exfoliated canvas - Cracked tooth bottom - Side of belt cracked - Side of belt badly worn - Badly worn teeth - Missing tooth It is advisable to replace belt while reconditioning the engine. NOTE: Normal belt should have clear cut sides, as if cut with a sharp knife. In initial stage of wear, load side tooth flank will look like fluffy canvas fiber, rubber gone and colour changed to white. In last stage of wear, canvas on load side tooth flank will be totally worn out exposing rubber. ASSEMBLY OF CYLINDER HEAD Install valves in their respective positions. Install spring seat, valve spring and valve retainers. Fig. 103 Fig. 104 Fit support rail, 2654 5890 05 06 on cylinder head. With spring compressor, 2654 5890 05 07 compress valve spring and instal l valve lock halves. Refer Figure 103 IN CASE OF ANY REPLACEMENT OF TAPPET/ VALVES OR MACHINING OF VALVE SEAT USE THINNEST SIZE OF SHIMS. Install original or thinnest size shims in their respective positions. Refer Figure 104 Apply light coat of moly paste grease over shims. Smear tappet outside diameter with engine oil.
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