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1999 VT1100C2 A. C. E.
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As for the washer on the oil drain bolt:
h13man is correct. Flipping the washer is an "emergency" coping procedure when a new washer is unavailable. Whether or not flipping it over is better than not, opinions vary. Never seen any convincing evidence either way. Not using any washer at all? That's a recipe for problems later.

As for VT1100 oil leaks:
Guide plug leak is common on the single-pin-crank engine installed on all 1100 ACEs and 1100 Aeros through 1999. Very unlikely on other 1100s but definitely possible. The hallmark tell is oil dripping off the coil around the lower front radiator hose. Some links will be in a following post.

Improper installation of the drain plug and/or oil filter is probably most likely after the guide plug. Washer's been beaten around. The oil filter might leave the seal behind when removed; the new filter -- with 2 seals -- will definitely leak if the old seal isn't removed. Easy, but messy, to fix.

Next most likely source is the seal (actually, an O-ring) on the water pump. Replacing it is a MAJOR exercise -- as in pulling the engine from the frame. It is possible to merely disconnect the engine, cant it within the frame then slip the water pump out and back in again. Not sure it saves much time, though.

The seals within the heads deserve mention though the amount of oil is negligible. More an irritation than a problem.

AFAIK, that's the complete list of common oil leaks for VT1100s.
 

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1999 VT1100C2 A. C. E.
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9,258 Posts
Guide plug oil leaks links:

Sept. 1999 "the wrench" that first described the problem. ("the wrench" was a newsletter for Honda Powersports service techs.)

HarryC's Youtube videos with the best approach to repair seen to date:
first
second
third

Older (2007 or earlier) stuff:

"Patch" instructions -- good for maybe 1,000 miles

Repair instructions - 1100 Aero -- note there was at least one part number error found and all part numbers were for a 1998 VT1100C3

My addendum to those instructions -- based on repairing a 1999 VT1100C2


On my bike, the original repair was redone after 7 years / 40,000 miles when replacing the stator. There had been no leak during those years and miles.

HarryC's repair was subsequently applied after 6 years / 40,000 miles when replacing the stator. There had been no leak during those years and miles.
 

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2003 ACE 750CD, 1998 ACE Tourer
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90 Posts
Discussion Starter · #23 ·
The aluminium crush washer should be used once and thrown away or replace it with a copper washer and be done with it. Had folk literally brag that they don't use any at all. :unsure: The Valk had this issue when she came home. Somebody smashed the aluminum crush washer so bad it distorted and cracked.
If the few drops that came out overnight after a light run were from the washer, would it necessarily be totally obvious with a touch of fingers on the bolt area?
 

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1999 VT1100C2 A. C. E.
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If the few drops that came out overnight after a light run were from the washer, would it necessarily be totally obvious with a touch of fingers on the bolt area?
Leaking washer should be easy to detect. Running the bike isn't necessary -- leak should be there all the time. Heating the oil will get you some extra drips but the leak would be there anyway. Should be able to find a drop hanging off the bolt head sooner or later.
 
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