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Is this for a manual tach?

D

Driver2022

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Joined
Nov 6, 2022
Messages
27
Location
Ireland
I screwed this piece out of under the oil filter housing.

The probe at the end spins as if it's a tacho of some sort? Could it be the tacho for the revs?

The engine is a 4bd1 turbo
 

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D

Driver2022

Active Member
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Nov 6, 2022
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Location
Ireland
Should have added the smaller piece with the probe screws into this piece below which in turn screws into the bottom of the filter housing
 

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kshansen

kshansen

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Central New York, USA
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Not knowing a thing about that engine I'm thinking it is not a tach drive. Does that small part that you said turns have a ridge down one side the would pilot onto a slot down inside the part it screws into?

Sorry if not really helpful but not seeing the parts in person I can only guess. I did try to look at some online books for that engine but could not find anything to be sure what it is.
 
C

Cliffy

Well-Known Member
Joined
Oct 14, 2023
Messages
59
Location
Qld
Think its a oil pressure regulator valve.
Guessing the top is removable and will have a thread and lock nut under it. The spinning of the pin might be adjusting the length of it and changing the preload on the spring.
 
Last edited:
D

Driver2022

Active Member
Joined
Nov 6, 2022
Messages
27
Location
Ireland
Cliffy said:
Think its a oil pressure regulator valve.
Guessing the top is removable and will have a thread and lock nut under it. The spinning of the pin might be adjusting the length of it and changing the preload on the spring.
Click to expand...
There is a spring inside there alright which that spinning pin seems to go into.

I'm looking for somewhere on this Isuzu 4bd1 tengine where I can put in a manual oil pressure gauge with a capillary tube.
 
Syleng1

Syleng1

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Joined
May 31, 2019
Messages
123
Location
Communist state of Connecticut
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Welder- farmer
1) t into the existing oil gauge lite
2) a mechanical tach drive did not exist that engine to my knoledge. Maybe a pulse generator on the alternator.
 
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