Ticking Noise When Cold Due to Broken Exhaust Manifold Studs on Nissan Pickup (D21)

The exhaust manifold on the 3.0 liter engine often warps and cracks, breaking off the studs between the cylinder head and the exhaust manifold.   The noise may be most noticeable when the engine is cold.

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Average mileage: 153,200 (90,000–232,500)
6 model years affected: 1990, 1991, 1992, 1993, more1994, 1995
14 people reported this problem
7 people shared problem details
Exhaust manifold leaking due to warped surface contact. Noisy exhaust. Replacement of exhaust manifold.
mine is actually an 87, but have had the same problem . .either broke off or vibrating out, set to specs with a touch of lock tight. which probably burned off rite away . .
Exhaust manifold cracked along with the ex. man. studs breaking. Head seems to have been machined unevenly.
exhust manifold cracked broken studs
I've wondered where the ticking sound came from. I only hear it when the engine is cold.
a ticking noise at engine mostly on passenger side
loud ticking from the engine... most likely a hole in the manifold. only at idol is when you hear the loud "clapping"
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the exhaust pipe snapped off 8 inches from the manifold and i need to get it fixed ASAP

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