Now that i've received the Bosch 80035 pen style glow plugs and converted my 1978 300D to pen style glow plugs with parallel wiring, it starts like a champ, but after i took it for a test ride (about 10 miles) i stopped at a traffic light, and after a few seconds, i've heard a loud metallic clicking sound from the engine.
After i took off to stop in the next parking lot, the noise went away, it came back after a while and after a minute or so it went away again.
Now there is NO noise anymore ????


Could it be that some of the carbon build up fell into the combustion chamber ?

(i did not ream out the holes, my bad, i know...)

Inspect the usual suspects:
* Contaminated or low cetane fuel = injector noise, nailing, rattling.
* Low oil = knocking - rattling.
* Belts = squealing, slapping, knocking - rattling.
* Alternator = squealing, scraping, grinding, knocking - rattling.
* Fan/shroud = scraping, grinding, knocking - rattling.
* Engine mounts = scraping, grinding, knocking - rattling.


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__________________
ASE Master Mechanic
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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
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Technical Quality Auditor.
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1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

Depending on they type of Air Filter Housing you have the Rubber Mounts can be broken, Nuts missing from them or the Bracket can be cracked.

When I first bought My Car mine intermittently vibrated to the extent I though something was going to break loose. But, I don't know what type of Air Filter Housing your 78 has.

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84 300D, 82 Volvo 244Gl Diesel