[TR] OD Oil

[Reihing, Randall S.]

This is an interesting discussion regarding MT90 gear oil versus 30 wt. non-detergent oil in TR3 gearboxes. 

My humble opinion is that I fully agree with Randall that using MT90 gear oil is the best option for the TR3 gearbox. 

It's all about the oil film's resistance to pressure, or the maximum psi the oil film can withstand between rotating/sliding parts in close proximity to each other during periods of high loads. The maximum pressure the MT90 oil film can withstand before failure is somewhere around 500,000 psi. It's not likely that any metal-to-metal contact can occur in a TR3 gearbox that will generate forces sufficient to pinch off that MT90 oil film and allow metal-to-metal contact, a primary contributor to premature wear. Not so with 30 wt. oil whether it's non-detergent or not. The 30 wt. oil does not provide an oil film with equally high pressure protection from metal-to-metal contact that the MT90 oil film provides and while the 30 wt. oil may work in the short term, the gearbox will not have the life span of the same unit using the factory recommended 90 wt. gear oil. 

The only downside I can see is that winter driving may require some time for the TR3's gearbox to warm up or shifting gears may take a little extra effort before the gearbox and it's oil warm up a little. But then, here in NW, Ohio, I never  drive my TR3 in the winter. It's just not the same experience when it's 10-20F outside.

Randall Reihing
1959 TR3A




________________________________________
From: Triumphs [triumphs-bounces at autox.team.net] on behalf of David P [frogeye at porterscustom.com]
Sent: Tuesday, June 19, 2018 9:25 PM
To: Jeff Scarbrough; TERRY SMITH
Cc: Triumphs (triumphs at autox.team.net)
Subject: Re: [TR] OD Oil

Non detergent oils are formulated to allow particulates to settle out
and not be recirculated. DaveP


On 6/19/2018 11:59 AM, Jeff Scarbrough wrote:
> On Tue, Jun 19, 2018 at 1:34 PM, TERRY SMITH <terryrs at comcast.net> wrote:
>> Hello, everyone.  Now I've got the OD sorted and working well consistently, I thought to turn attention to the OD oil.  I'm running MT-90 now, mostly because it's the most highly recommended by you all and it was necessary to eliminate every possible variable that might have been contributing to the OD woes I was having.
>>
>> When the OD was rebuilt, the technician put in simple Napa 30 weight oil.  He was convinced it worked just fine.
>>
>> So my question.  I've forgotten whether it was non-detergent.  I suspect so,since wouldn't that give it more grip????
> I think the ND is to eliminate foaming.  I started with 30 weight
> Non-Detergent in mine, but switched on the second change to MT-90.
> Works a treat.
>
> Jeff Scarbrough
> Corrosion Acres, Ga.
>
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--
Porter Custom Bicycles 2902 Arno St. NE Albuquerque, NM. 505-352-1378 My World go here: WWW.PORTERBIKES.COM/


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