P38A Bonnet Insulation??

Stevekennah · Feb 7, 2019

Does anybody know the what job the bonnet insulation does on the P38?? I've only just noticed that mine is missing....

Would it be worth sourcing a replacement or just leaving it alone??

Thanks

ukadamwest · Feb 7, 2019

mainly sound deadening, probably some heat reduction in preventing the paint finish being exposed to engine temperatures

mozz smith · Feb 8, 2019

theres an old wise saying "if it ain't broke don't fix it , why spend money you will need for other jobs, and on a p38 there all there waiting to test your patience and your wallet !!!! regards mozz

Stevekennah · Feb 8, 2019

Thanks all for the sound advice.... I think I will it alone

RangeRoller dt · Feb 8, 2019

Sound deadening and heat insulation. I've considered taking mine off as my diesel recovers from hot start much quicker with bonnet on catch because of the gap between the insulation. If I do you can have it, but it's a potch and you should be fine

Stevekennah · Feb 8, 2019

RangeRoller dt said:
Sound deadening and heat insulation. I've considered taking mine off as my diesel recovers from hot start much quicker with bonnet on catch because of the gap between the insulation. If I do you can have it, but it's a potch and you should be fine

Much appreciated if you do take it off...... Beer tokens await

wammers · Feb 9, 2019

RangeRoller dt said:
Sound deadening and heat insulation. I've considered taking mine off as my diesel recovers from hot start much quicker with bonnet on catch because of the gap between the insulation. If I do you can have it, but it's a potch and you should be fine

Now that is a new one. Remove acoustic shield to cure hot start problems. Now i have heard everything.

RangeRoller dt · Feb 9, 2019

wammers said:
Now that is a new one. Remove acoustic shield to cure hot start problems. Now i have heard everything.

It's not a cure but I find engine cools a lot quicker, and therefore will start, with bonnet open even a little bit. Have to leave it a while if closed I'm convinced the 'insulation' - there's a clue

- helps keeps heat in.

Bear in mind that (until I'm confident to change my FIP/chains) my current hot start solution is an emergency bottle of cold water in the boot! Lol.

Not Wammers approved, but works for the moment

wammers · Feb 9, 2019

RangeRoller dt said:
It's not a cure but I find engine cools a lot quicker, and therefore will start, with bonnet open even a little bit. Have to leave it a while if closed I'm convinced the 'insulation' - there's a clue - helps keeps heat in.

Bear in mind that (until I'm confident to change my FIP/chains) my current hot start solution is an emergency bottle of cold water in the boot! Lol.

Not Wammers approved, but works for the moment

Why don't you just retime the static? Or fit a hotfix in the interim.

RangeRoller dt · Feb 9, 2019

wammers said:
Why don't you just retime the static? Or fit a hotfix in the interim.

Would you trust me to butcher into your wiring loom?...

Best not

Static timing is good point, given that I have the help of everyone on here. Do you think I could pull it off without a diagnostic to check modulation?

I wish I'd found this place when @JohnnyCrash was here.

wammers · Feb 9, 2019

RangeRoller dt said:
Would you trust me to butcher into your wiring loom?... Best not

Static timing is good point, given that I have the help of everyone on here. Do you think I could pull it off without a diagnostic to check modulation?

I wish I'd found this place when @JohnnyCrash was here.

If static is done correctly modulation should be fine. You need several special tools to do static. And of course the ability and knowledge to do it. On your car you have to consider that dependent on mileage your injection pump and injectors maybe getting tired.

RangeRoller dt · Apr 7, 2019

wammers said:
If static is done correctly modulation should be fine. You need several special tools to do static. And of course the ability and knowledge to do it. On your car you have to consider that dependent on mileage your injection pump and injectors maybe getting tired.

After 2months I'm nearly there. Stàrting to get my head around it and will have @Bagshot s DTI gauge/timing kit this week.

I understand how to take the whole head off so I can see where the cylinder is and set TDC on from there with new chains.
Problem is I've 142,000miles and only Intend to retime the FIP to account for mileage/slack for now. I can't judge TDC from cam as chain slack may mean cylinder is out and visa versa

.*. - how do I get an accurate zero on the gauge from FIP? Some say turn crank anti-clockwise but you previously mentioned clockwise only (or is that when chains are off only)

wammers · Apr 7, 2019

RangeRoller dt said:
After 2months I'm nearly there. Stàrting to get my head around it and will have @Bagshot s DTI gauge/timing kit this week.

I understand how to take the whole head off so I can see where the cylinder is and set TDC on from there with new chains.
Problem is I've 142,000miles and only Intend to retime the FIP to account for mileage/slack for now. I can't judge TDC from cam as chain slack may mean cylinder is out and visa versa
.*. - how do I get an accurate zero on the gauge from FIP? Some say turn crank anti-clockwise but you previously mentioned clockwise only (or is that when chains are off only)

Position of cams is how you tell you are at number one firing TDC. You use the cam positions to fit locking pin in flywheel. Cam timing will not be miles out. Read Rave and follow it to set DTI to zero and fit lock pin, then read pump cam lift, it is fairly easy to do.

RangeRoller dt · Apr 7, 2019

wammers said:
Position of cams is how you tell you are at number one firing TDC. You use the cam positions to fit locking pin in flywheel. Cam timing will not be miles out. Read Rave and follow it to set DTI to zero and fit lock pin, then read pump cam lift, it is fairly easy to do.

I'm on it. Will start new thread when studied up. Come long way from revoming insulation to cure hot start

Grrrrrr · Apr 7, 2019

Follow RAVE. A complete idiot can do it ... I did.

RangeRoller dt · Apr 7, 2019

Good, I am also, as you know

Don't forget I'm new to all this, no Horology NVQ Or nothing

Just what you guys have taught me since this thread. Which is good - I don't get confused by things Irrelavant ( like liners )

P38A Bonnet Insulation??

Stevekennah

Active Member

ukadamwest

Well-Known Member

mozz smith

Well-Known Member

Stevekennah

Active Member

RangeRoller dt

Well-Sprung Member

Stevekennah

Active Member

wammers

No longer with us, RIP

RangeRoller dt

Well-Sprung Member

wammers

No longer with us, RIP

RangeRoller dt

Well-Sprung Member

wammers

No longer with us, RIP

RangeRoller dt

Well-Sprung Member

wammers

No longer with us, RIP

RangeRoller dt

Well-Sprung Member

Grrrrrr

Technician, Bodgit & Scarper Ltd

RangeRoller dt

Well-Sprung Member

Similar threads