Adjusting tappets

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24 Sep 2018 06:55 #1 by Peter Davis
Peter Davis created the topic: Adjusting tappets
Do the tappets need to be adjusted when the engine is cold?
How does one do it it on their own? Last time I had the father in law turning the engine from below whilst I viewed and adjusted from above, but he's getting too old to help now. I was thinking of using the starter motor but I don't think one could get it to stop in the right spot.
Cheers
Peter

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24 Sep 2018 12:18 - 24 Sep 2018 12:19 #2 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: Adjusting tappets
From the manual, I used to turn it with a socket on the nut holding the harmonic balancer on.

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
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Last Edit: 24 Sep 2018 12:19 by Peter and Sandra OKA 374. Reason: addendum

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24 Sep 2018 18:21 #3 by Holmz
Holmz replied the topic: Adjusting tappets
If it does not have a LSD, then I would be inclined to lift a rear wheel and turn one of the wheels.

It will require ~2-1/2 more torque required than just using the harmonic damper - assuming you whack it in top gear.

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24 Sep 2018 19:15 - 24 Sep 2018 19:16 #4 by outyonda
outyonda replied the topic: Adjusting tappets

Holmz wrote: If it does not have a LSD, then I would be inclined to lift a rear wheel and turn one of the wheels.

It will require ~2-1/2 more torque required than just using the harmonic damper - assuming you whack it in top gear.[/quot


? Holmz how are you going to see wich piston is on the rock when you are turning the wheel !!


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Last Edit: 24 Sep 2018 19:16 by outyonda.

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25 Sep 2018 16:45 - 25 Sep 2018 16:54 #5 by Holmz
Holmz replied the topic: Adjusting tappets

outyonda wrote:

Holmz wrote: If it does not have a LSD, then I would be inclined to lift a rear wheel and turn one of the wheels.

It will require ~2-1/2 more torque required than just using the harmonic damper - assuming you whack it in top gear.



? Holmz how are you going to see wich piston is on the rock when you are turning the wheel !!


I would use chalk marks on the tyre.

The maths:
- The tail-shaft turns at 4.88 times the pair of axels turns.
- The tail-shaft turns at 2.44 time for a single axel turning.
- Factor in the top gear ratio as required... if it is less than 1:1 then the ~half of a wheel turn makes a complete crank turn.
if it is 0.61 then ~2/3 of a tyre rotation is a complete crank rotation.

It is likely easier to turn the crank directly, but I chucked it out as an idea... or if the wheel brace and jack is handier than the harmonic damper socket.
(Not all my ideas are good)
Last Edit: 25 Sep 2018 16:54 by Holmz.

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26 Sep 2018 18:02 #6 by Holmz
Holmz replied the topic: Adjusting tappets

Holmz wrote:
I would use chalk marks on the tyre.

The maths:
- The tail-shaft turns at 4.88 times the pair of axels turns.
- The tail-shaft turns at 2.44 time for a single axel turning.
- Factor in the top gear ratio as required... if it is less than 1:1 then the ~half of a wheel turn makes a complete crank turn.
if it is 0.61 then ~2/3 of a tyre rotation is a complete crank rotation.

It is likely easier to turn the crank directly, but I chucked it out as an idea... or if the wheel brace and jack is handier than the harmonic damper socket.
(Not all my ideas are good)


Well... no prize winners?
Someone should have caught the error of dividing 4.88 by 2 rather than multiplying it by 2...

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28 Sep 2018 06:07 #7 by Peter Davis
Peter Davis replied the topic: Adjusting tappets
So I take it that no one has adjusted the valve tip clearances on their own. A 2 man job.

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28 Sep 2018 08:21 #8 by Peter Davis
Peter Davis replied the topic: Adjusting tappets
Confusing. The work shop manual (see Peter and Sandra's earlier post) says engine cold. The Perkins glovebox guide says hot or cold. Has anybody found out which it is?

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28 Sep 2018 08:48 #9 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: Adjusting tappets
I'd reckon cold would be much easier, less sweat on the rocker gear from the bloke doing the job, better for the missus turning the crank underneath ;-)))

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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28 Sep 2018 11:12 #10 by mort
mort replied the topic: Adjusting tappets
Hi Peter,
Yes you have read it correctly hot or cold is the same unlike other engines where there is different measurements for hot and cold but I would do cold as it is more comfortable.
I have done my tapperts myself by installing longish bolts into the harmonic balancer x 3 and used a long leaver to turn the engine it worked fine and I also cant see Hilda getting under and turning for me and I wouldnt ask her.
Martyn

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28 Sep 2018 14:26 #11 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: Adjusting tappets
I've got a 6 1/2 tonne 4 post hoist in the shed so she can stand underneath ;-)))

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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01 Oct 2018 06:12 #12 by Tony Lee
Tony Lee replied the topic: Adjusting tappets

Peter Davis wrote: So I take it that no one has adjusted the valve tip clearances on their own. A 2 man job.


Or could mean that I have nevef bothered to do it.

I'll add it to the list

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01 Oct 2018 12:46 #13 by Hydramech
Hydramech replied the topic: Adjusting tappets
I adjust tappets all the time using a remote starter button. A length of twin core with one alligator clip to the positive terminal of the starter and one to the start terminal on the solenoid. Occasionally you may go over compression but you just go around again. This way you can see the rockers on the rock.
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02 Oct 2018 12:13 #14 by mort
mort replied the topic: Adjusting tappets
Peter, We would all like a 6 1/2 tonne hoist and even better is a shed tall enough to have an oka on top of the hoist, all I can say is thanks for letting me know what I am lacking... 1 power Ball.
Martyn
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02 Oct 2018 17:34 #15 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: Adjusting tappets
Mort our first house actually came with a large shed and one side had a pit in it so I was spoilt from the start. Twenty years later when we decided to leave the big smoke the criteria for the next place was to either already have a suitable shed or the room to build one. The house we bought had the room so I started the exercise to build the shed, as you can imagine councils were created to give as much grief as possible and a pit was the first to go, which then meant high enough for the hoist which was another stumbling block which we eventually overcame. Hoists are actually not that expensive and $6 grand for a 6.5 tonne single phase with two 3 tonne rolling beams/scissor lifts was pretty good I thought, never mentioned to the council anything about the hoist though!

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
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10 Oct 2018 06:50 #16 by Tins
Tins replied the topic: Adjusting tappets

Peter and Sandra OKA 374 wrote: I've got a 6 1/2 tonne 4 post hoist in the shed


Well, that's one way of getting people to drop in;)

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10 Oct 2018 13:21 #17 by DarrenWebster303
DarrenWebster303 replied the topic: Adjusting tappets
Pete, the best way to adjust Perkins tappets on your own is hot. Start at the engine mounts with a new cutting tip & full bottles preferably.

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10 Oct 2018 15:13 #18 by 210greg
210greg replied the topic: Adjusting tappets
That's not luvin we all don't wish to live on the dark side
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