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Offline IMDMAN

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Engine rattle on startup
« on: July 08, 2016, 05:43:05 am »
What causes the loud rattle when engine is started and is there a fix?

Offline Coconut

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Re: Engine rattle on startup
« Reply #1 on: July 08, 2016, 06:13:57 am »
Proably the hydraulic cam chain tensioner - if it loses its pressure on the chain while standing,
it takes a few seconds to become re-pressurised after engine start,
and apply the correct tension to the chain which should then stop rattling.
( According to the service Manual this should take "up to 5 seconds" ).

If your Dealer thinks the noise is severe enough, or if it lasts longer than 5 seconds
quote the Service Manual information to them and ask for them to apply to Triumph
for a warranty replacement.

Discussed previously here : Cam chain tensioner

and here :  Engine noise on start up

« Last Edit: August 02, 2020, 09:07:35 pm by Coconut »

Offline IMDMAN

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Re: Engine rattle on startup
« Reply #2 on: July 08, 2016, 08:43:27 pm »
So this has nothing to do with the head replacement I have read about?   Just seems it has gotten much worse sine I got the bike.

Offline Zebraranger

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Re: Engine rattle on startup
« Reply #3 on: July 08, 2016, 09:13:05 pm »
If you're talking about the diesel sounding rattle, that's normal.

Offline triucati

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Re: Engine rattle on startup
« Reply #4 on: July 08, 2016, 09:20:26 pm »
It is not related to the head replacement.  Mine makes the rattle noise for about a second at startup, but not every time.  It occurs most often when bike has sat for a couple days.  And has done this since day one.  I made note of this to my dealer, and they assured me this noise is normal (cam tensioner).  It can sound awful though.

Offline OhioWinger

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Re: Engine rattle on startup
« Reply #5 on: July 08, 2016, 09:22:29 pm »
This guys video at 3:15, shows the diesel sound which is normal.


Offline PhilInAthens

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Re: Engine rattle on startup
« Reply #6 on: July 09, 2016, 03:27:24 pm »
*Originally Posted by Coconut [+]
Proably the hydraulic cam chain tensioner - if it loses its pressure on the chain while standing,
it takes a few seconds to become re-pressurised after engine start,
and apply the correct tension to the chain which should then stop rattling.
( According to the service Manual this should take "up to 5 seconds" ).

If your Dealer thinks the noise is severe enough, or if it lasts longer than 5 seconds
quote the Service Manual information to them and ask for them to apply to Triumph
for a warranty replacement.

IMDMAN; Coconut is right (as always).  However, you didn't mention the your bike's year of manufacture. A service bulletin about the head (discussed at length elsewhere) addressed issues related to improperly sized oil journals in the earlier year bikes' heads. My bike was not included in the VIN range, being build a shade later. BUT, my bike on cold (or sometimes warm!) starts would sound like a can of rocks for several seconds after start. Triumph replaced the head and now, as Coconut says, a rattle sound at start (cold only) lasting ~5-seconds is normal.

As Coconut wrote, a dealer assessment might be in order.  They'll need a cold engine to assess properly.  :821:

Offline thumper

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Re: Engine rattle on startup
« Reply #7 on: July 09, 2016, 08:30:56 pm »
*Originally Posted by triucati [+]
It is not related to the head replacement.  Mine makes the rattle noise for about a second at startup, but not every time.  It occurs most often when bike has sat for a couple days.  And has done this since day one.  I made note of this to my dealer, and they assured me this noise is normal (cam tensioner).  It can sound awful though.

 :0461:   

Both my Explorer and my Trophy do this occasionally.    Knowing it's a characteristic of this engine, I'm not worried by it.
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