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Sun, December 22 2024, 01:07 [ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, [3], 4, 5, 6, 7, 8, 9 ]

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Date Posted: - Sunday - 07/ 3/11 - 11:21pm
Author: Paul M31 #106 NJ
Subject: I checked the service manual and can't find an oil seal
In reply to: Randall, Murre, M31 's message, "Raw Water Pump Issue" on - Sunday - 07/ 3/11 - 2:42pm

The one seal that is clearly part of the pump assembly is the one preventing raw water from seeping towards the engine... I see no seal preventing some oil from entering the weephole chamber.

The pump shaft is an independent, slotted fitting into a receiver in the heavy duty injection pump gear drive, which in turn is driven directly off the main timing gear assembly. The raw water pump is mounted on the engine with four bolts, with its drive shaft (ending in a female flathead screwdriver slot)inserted into a hole in the massive injection pump gear where it links up with a male "flathead screwdriver end). The mechanical fit seems fairly loose and I see no special seal to prevent oil from following the raw water pump shaft towards weeping hole chamber.

I have the schematics and exploded views of the whole assembly - raw water pump as well as injector pump - and I can certainly send it to someone's email if that would help (pdf file).

Bottom line, I would not worry about it too much for now, but keep an eye on any increase in weeping... but more so about any grinding or thumping noise coming from behind the raw water pump. There are two massive bearings behind there and I guess if these are failing, some funny things could happen.

An old mechanic's trick it to take a long screwdriver and put the metal end on the area you're monitoring and the tip of the handle "in your ear", as if you are trying to block sound in that ear with the handle. You will be amazed (scared?) by how much you can hear like that - it is best for establishing "change" more so than diagnosing anything at first hand. Listen to the rumble and remember how it sounds... later, that rumble should be about the same (at the same rpms) - if there is an addition of a new sound, like a distinct ricketytick or a thump, you know something's going on in there.

Another trick is to check the weeping oil/fluid for metal - stick a small magnet in the strean and check it for ittl filings.

Let me know if I can be of any help at all...

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[> Oops - went to the Parts List and there IS a seal on the oil side -- Paul M31 #106 NJ, - Monday - 07/ 4/11 - 12:03am

There are two seals with the telltale hole in between.

The water seal is listed as "mechanical seal" and is quite robust - sits right behind the impeller retaining ring. The oil side "seal" looks wore like some sort of O-ring and sits right in front of the rear ball bearing - The weep hole would see bothoil or water passing their respective seals.

I guess the pump housing becomes integral with the gear cover and any oil splashing around in there and wetting the pump shaft would be stopped from entering the weephole chamber by the O ring (though the picture shows it as a square "seal".

See this attachment:

Photobucket

#14 is the "seal" that would stop oil from entering the weephole area; the water seal is #4 and listed as "Mech Seal"


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