SPArKy_Dave

Mainly US and EU spec's I believe, but some may apply to Australian Vehicles? https://www.oilspecifications.org/ford.php?fbclid=IwAR2oDSFk-zD91i47yM0ygo7nm1xE22BZU9t7l63wBeXTHVlqr0Zoc5Oi3hk

XH utes got given a domed roof, to increase vehicle head-room inside the cab. I believe there is a difference.

Just a quick bump to THIS thread... For anyone wanting the Crossflow 1-3/4 welsh plugs - Premier Engine Components (Nasons), makes a full (Australian Made) brass welsh plug kit with x5 1-3/4 plus x2 2-1/16 and x1 tiny 7/16 plug - part no. WPEK971 OR they also have the 1-3/4 cup welsh plugs by the bag of x10 - part no. BC1034 (brass), PMSC1034 (steel), SSC1034 (stainless steel) https://premiermachinery.com.au/wp-content/uploads/2020/06/premier-welch-plugs.pdf Precision Engine Parts sells brass welsh plugs individually, but not sure on the brand. Part numbers as follows - 7/16 - CP0010 1-1/2 - CP0250 1-3/4 - CP0320 2-1/16 - CP0450 https://precisionintl.com/v/ford-australia-falcon-xf-4-1-1986-1993-petrol-ute/c/100000-standard/106000-cooling-fuel-oil-systems/106169-core-plugs Merry Christmas.

You begin the spark early - BTDC (before top dead center). How early is based on fuel type (petrol/LPG flame propagation time) engine rpm, combustion chamber and piston design. So we light the fuse early, the flame spreads for a while, and by the time peak cylinder pressure occurs, your crank is around 12 ATDC (after top dead center). If peak pressure occurred any earlier than that, it would be like a sledgehammer driving the rod into the crank straight down. By peaking after TDC, the rod acts like a lever instead of a railroad spike.

From memory, those E-series under-bonnet relays are used even on B-series and FG's etc. Good work, isolating the problem. Easy fixes are always the best!

Could always be dodgy relay contacts? See if you can track down, where the noise is coming from. Yes it's Ford specific, and not available aftermarket, that I've ever seen.

It's an auto-reset circuit breaker - usually a 30A rating. Uncommon, but they CAN get corrosion internally, which trips the circuit when it shouldn't.

Here's some more JEEP info for you - the 80's/90's glovebox locks, are the same as XD-XH, except colour-coded to the Jeep interiors.

Re-ordered for clarity - SPOT BEAM comparison

Re-ordered for Clarity - HIGH BEAM comparison

Re-ordered for clarity - LOW BEAM comparison

The aftermarket ones look like they're not stamped correctly -

In my experience, the aftermarket spring coils are often cut a bit short - ie, they don't leave a small straight section of coil, to match up to the saddle tab - as the factory springs do. Some coil spring brands, are worse than others. There's also a difference, between the Australian OEM style spring saddle tabs, (separate spot-welded tab) and the USA Mustang style saddle tabs (integral with saddle tab) 99% of the aftermarket Falcon spring saddles, are the Mustang type - as per yours.

The spring coil, doesn't have the correct end cut, for Falcon spring saddles - see how it's missed the saddle stop tab? That is a problem.

Fun fact - XD headlights were made by Bosch aftermarket lenses made by SAP XE headlights were made by Hella aftermarket lights AND lenses, made by SAP and TYC XF/XG headlights were made by Lucas aftermarket lenses made by SAP, TYC and DEPO/Lucid aftermarket lights made by TYC and DEPO/Lucid