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TR8 suddenly won\'t start

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DAVID MASSEY

TR8 suddenly won\'t start
« on: November 14, 2019, 02:52:58 PM »
Skipping one tooth will effect how it runs but they usually will run still.B

You will have to skip a number of teeth to make it not run anymore.

But the easiest way to check for spark is with a timing light which will also

let you know if it is properly timed.B  Two birds with one stone.



Dave







-----Original Message-----

From: James Tencate <tencate@mac.com>

To: charles frink <acltpvd@hotmail.com>

Cc: tr8 <tr8@mercury.lcs.mit.edu>

Sent: Thu, Nov 14, 2019 11:05 am

Subject: Re:  TR8 suddenly won't start



someone once told me that jumped timing chains were uncommon, not unheard of,

but reasonably rare...



BUT if the timing chain skipped a tooth, yes it's the sparks! they're not

happening at the right time :-)



Good point!



> On Nov 14, 2019, at 9:26 AM, charles frink <acltpvd@hotmail.com> wrote:

>

> Jim

>

> I wonder if the motor has a case of jumped timing chain ?B  The sudden

onset

of symptoms would indicate , at lease to me, that it is a timing issue .

??????????????

>

> Charles

> From: owner-tr8@mercury.lcs.mit.edu <mailto:owner-tr8@mercury.lcs.mit.edu>

<owner-tr8@mercury.lcs.mit.edu <mailto:owner-tr8@mercury.lcs.mit.edu>> on

behalf of James Tencate <tencate@mac.com <mailto:tencate@mac.com>>

> Sent: Thursday, November 14, 2019 7:51 AM

> To: tr8@mercury.lcs.mit.edu <mailto:tr8@mercury.lcs.mit.edu>

<tr8@mercury.lcs.mit.edu <mailto:tr8@mercury.lcs.mit.edu>>

> Subject: Re:  TR8 suddenly won't start

>

> Me? I'd start with ignition and make sure you have good spark at the right

> time. With carbs it's usually problems with spark OR fuel so just double

check

> the sparking can rule that whole side of the equation out right away (so

you

> can focus on fuel delivery). Which seems most likely to me at this point.

>

> [I should note that with FI, you always check spark AND/OR fuel (in that

> order). The fuel injection won't work if there's no spark, compounding your

> debugging so making sure you have sparks at the right time is FIRST

priority,

> then fuel pressure, then fuel injection.]

>

> But you're carb'd. As others suggest, check fuel pressure and keep us

posted.

> You'll discovered lots of us will have ideas and lots of them will probably

be

> proven NOT to be the case but we're happy to offer things to check!

> --

> .

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