LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Cracked head? Broken lifter (pictures)

Old 01-15-2019, 03:38 PM
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Cracked head? Broken lifter (pictures)

Symptoms: 1. Loss of coolant, not leaking; 2. Tappet noise.

Pulled heads. Broken lifter - intake on number 3 cylinder. Tan mineral deposits on head, valves, and piston on number one cylinder. Tan deposits only in cylinder one. No apparent issue with head gasket in that area. Thought it was a crack from coolant hole to cylinder head area. Machine shops says no crack. Divot in head allowed coolant leakage. Surfacing heads to address divot and slight warping.

Replacing all lifters - $128 insurance policy.

Last edited by BMX Dad; 01-15-2019 at 03:42 PM. Reason: errors
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Old 01-18-2019, 07:32 PM
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Re: Cracked head? Broken lifter (pictures)

You might pay a little extra attention to the threads of the #3 intake rocker arm stud.

As that lifter's pushrod cup retainer came loose it allowed the cup to turn and apparently jack up the pushrod enough to pull on the threads of the rocker arm's stud. That then pulled on the cylinder head casting and flowed coolant between the head gasket and the cylinder head creating the "ditch."
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