Fitting a Chinese-made F10A engine to a Suzuki SJ 410: what you need to know

TL;DR: This requires some amateur machining skills. This also requires the SJ410's sump, oil pickup, and dipstick. It also requires either the SJ410's camshaft or a distributor from a late Vietnamese- or Myanmarese-market Suzuki Carry.

Did you know that the ancient Suzuki F10A engine is still produced today in China? As I write this, they are, because they are still used in brand new vehicles sold in Myanmar and Vietnam. And here's something somewhat more interesting than that: Manufacturers of these engines will sell them directly to customers in the West, even in single-engine quantities. Which is to say: if you need a new F10A engine, you can get in touch with one of their distributors, and have a brand new engine on your doorstep in a few weeks.

That sounds awfully tempting for any owner of a Suzuki SJ410 that has a worn engine; for significantly less than a grand (including the very expensive P&P), you could have a brand new engine in your SJ!

Here is what one looks like after it comes out of its box and goes onto a Draper engine stand:

I did say "box"! Bless these tiny engines; they're small enough that they can fit in a decently-sized, man-portable cardboard box with generous amounts of packing materials.

These Chinese-made engines (which I shall hereafter refer to as "Chinese engines") are designed for various small rear-wheel-drive trucks and vans that are still in use in a couple of Asian markets. The engine differs in subtle ways to the original F10A as fitted to the SJ410. It will require minor modifications to work with the ancillaries of the SJ, all of which I shall detail in this post.

Mounting points, general

Several of the mounting holes were drilled to...well, some thread that wasn't anything in particular. If you get any resistance winding in a metric bolt to any of these holes, don't force it. Use a tap to bring no-thread-in-particular out to a metric thread.

Camshaft

The supplied camshaft will almost certainly be incorrect; the distributor drive splines are angled in the wrong direction and will not drive the SJ410's distributor. Thus, you will either need to use your existing camshaft, buy a new one (available off-the-shelf), or fit a distributor that is appropriate for the camshaft. The correct distributor for the Chinese engine's cam should be the same as those fitted to later Vietnamese- and Myanmarese-market Suzuki Carry.

Alternator bracket

The Chinese engines use a different mounting point for the alternator bracket. This photo should illustrate this:

The spare hole at the top is where the Chinese engines are expecting the alternator bracket to bolt to, whereas the rightmost hole is where the SJ's alternator bracket wants to bolt to. The pegs are still there (presumably from the original casting) to accept a hole, but there is no hole or thread inside it. You will either have to modify your alternator bracket, or drill a hole and tap a thread into the still-extant mounting peg. The latter is what you see in the photo.

Engine mount brackets

You will need to drill out the engine-side holes in the engine mount brackets, because the Chinese engines have an M10 thread and the original SJ's engine uses M8.

On the exhaust-side engine mount, you'll have the same problem as you did on the alternator; the pegs for a mounting hole still exist, but you will need to drill into the peg and tap a thread for the engine mount. Be very careful here; it is easy to drill too far and thereby poke a hole into your crankcase area, and you'll end up with machining swarf chilling in your crankcase.

Sump & oil pickup

You will need to use the SJ410's original sump. This should clearly illustrate why:

The sump on the SJ410 engines has a large cutout at the front to clear your axle, and is somewhat deeper at the back. Of course, this is not necessary on rear-wheel-drive cars, so they have a flat, deep sump. If your SJ410 has a substantial-enough suspension lift kit, you might get away with it. Or you might smash an axle-sized hole in your sump, and not get away with it. It's much better to use the original sump.

For this reason, you're going to have to use the SJ410's oil pickup pipe, too, as the SJ410's picks up from a different place, and the Chinese engine's one will be too long for the SJ engine's sump. This will present you with another problem, which is that the extra length of the SJ's oil pickup necessitates an extra bracket to hold the oil pickup in place. This bracket is attached to a hole on the middlemost main bearing cap...

...which does not exist at all on the Chinese engine's middlemost bearing cap:

Don't try and use the SJ410's bearing cap; the tolerances down there are very tight. It is best to weld a nut onto the Chinese engine's main bearing cap.

Here's what that looks like:

You'll also need to use the SJ410's dipstick, or modify the Chinese engine's dipstick.

Spark plugs

Your Chinese engine may come with spark plugs. If it does, they will probably be mystery-meat spark plugs. They will do fine, in the short term. They will burn out soon enough, so you should definitely replace them at the first opportunity with a set of NGK plugs.

Addendum: the real work here and all of the learnings are those of Maurice Carter, who does not have a website. My contribution is limited to offering bad ideas, offering exactly two good ideas, taking photographs, and arranging some words to form some sentences that you just read.

In which I explore just how bad a decision this P5 was

On the weekend that has most recently passed, my mission was to find out exactly how bad or good Penny the P5 is. The good news is that everything is very good and really solid, despite the scruffy appearance. South Africa was very kind to Penny. There's only one little bit that looks a bit sketchy on one of the front inner wings and where it joins to the sill.

Also, there's almost nothing missing. Those bits that are missing might be a pain to find, but none of them would stop me getting it running. (I was immediately 250 quid poorer from buying three of those bits on Saturday. It's only money...)

What is not missing is this. Behold, 3 litres, 6 cylinders and 115 horsepower of IOE Rover FURY:

If you look at the far bottom right you can see a glass washer bottle! I was last-Saturday-years-old when I learned that was a thing.

I do wonder how necessary that gigantic airbox is. I also wonder if it could be replaced with a tiny K&N or Mishimoto cone filter. Or maybe a Range Rover airbox, since that's what I know to be sensibly-sized and what I know to have very little intake noise. Or maybe it can wait till I pull off my next terrible idea!

So, back to what I should be doing, which is to get the engine started. I said there's nothing that would stop me getting it running. But it's clear that all the wiring is not in a great state.

The wires exist and have not set on fire yet. It will almost certainly work to whatever extent it can, until it sets on fire. I can certainly foresee a situation in which I am going to replace some substantial part of the wiring just to get the engine started...and if I'm going to do that, then I might as well go all the way...

...which is to say I have decided to rewire the entire car, and do so for negative earth & an alternator, before I even attempt to get the engine running. This might be a bit of a brave move given that my knowledge of electrical circuits is limited to basic knowledge of how DC circuits work. Oh well, as a wise man said one time, the best way of getting started with something you don't know how to do is by starting to do it. Fortunately, you can buy entire wiring harnesses off the shelf from Autosparks, which should be about £512.40 if you add in the optional wiring for an alternator, electric fan, and radio feed (I don't intend to fit a radio to it, but I don't want to rule it out). Yep, it's only money...

As I knew before I bought it, the interior is totally shot:

It's not just the cover that is torn; whatever previously resembled foam on the seats has turned into something that is not at all like foam. It has the texture of compressed sand, in that it crumbles into dust when you squeeze it in your fingers. Also, almost every piece of woodwork has delaminated, and those bits of wood that are covered in other materials have had their coverings disintegrate. I think I might be able to learn enough woodwork by myself to fix some of those bits. The upholstery almost certainly needs to be done by someone else.

So, this isn't going to be an easy recommisioning - not that I thought it would be, even before I introduced this new complication. And definitely not cheap, though I knew that would not be the case either. I can afford it, but I will say that I will definitely be eating a lot of instant noodles over the next few months...

...and these are the God-tier mother of all instant noodles. Something, almost certainly, for a future review on the very website you are reading now.

Onwards!

Introducing Project Penny

I've been thinking about a backup car for Amy, my Mazda 323 GTX, for quite a while now. Not because I don't like her. She rules. She also doesn't work all the time. I've been wanting to take her off the road and get her indoors for a while now. I'd like to modernise & rationalise the turbo setup and the engine management. I'd also like to get her bodywork sorted once and for all, rather than the remedial work that I am doing now.

And also...a tiny, ridiculously rare turbocharged hatchback with poverty-spec features (wind-down windows, no air conditioning, no safety features at all) isn't exactly what I need in a daily. I'd actually like to make it to destinations, and get there in comfort, without spending three million pounds on fuel.

So. I needed something cheap, economical, sensible, modern, reliable, easy to find parts for, and with at least a few modern creature comforts as well. And that is why I bought

a three-litre Rover P5 from 1964, which might work, because Lewis Logic fucking rules. Say hello to Penny the P5!

(The car purchase is real, but the narrative may or may not be. All I'll say, is that when I first started writing this the narrative hook was along the lines of "I realised I could not officially be an old man unless I was driving a Rover". It's up to you to decide whether I was completely making shit up.)

This car spent most of its life in South Africa. The chap that owned her brought it over here about four years ago, then got ill, and died. Penny made her way to a dealer, who then advertised it on Car and Classic. Car and Classic's Chris Pollitt did a "Project Profile" feature piece, which was a great article that you should definitely read for more background on the P5 in general and the 3 Litre in particular.

I saw the article, and I immediately knew I had to have that car. I've had a bit of a soft spot for the P5 since I saw one at the end of Lock, Stock and Two Smoking Barrels, but I do not think I have ever been emotionally affected by one. I don't think any car ever has affected me as much emotionally as this one did via mere pictures on the Internet.

I sat on those "I need this car" thoughts for an entire work day. When I clocked off, I called the chap and provisionally reserved it. Exactly one week later, it was delivered to my driveway. And she is every bit as beautiful as she was in the photos.

So what's the plan?

My immediate plan, as in tomorrow lunchtime and this weekend, is to make everything watertight. Brand new door seals are included with the car, but not fitted. I'd also like to make the boot latch work (it does not work), and the bonnet to close (even better if I can open it again).

Next up, of course, I want to make it solid underneath. Because the car spent most of its life in South Africa, I am hoping that I will not have too much to do. South African weather is much kinder to cars than our own climate is. But the car is 57 years old, so no doubt I will be able to poke some holes in it.

In the meantime, I will have to go through some paperwork and some small amount of arse to get it registered in the UK. The guy who imported it never did. I am hoping this will not be too difficult. While this happens, I will not make any modifications to it - and by that, I mean not even replacing any parts with functionally identical modern ones. My reading of the rules for getting an age-related plate when "naturalising" a car is that every component must be original. My reading might be unreasonably strict, but I'm erring on the safe side because I do not want to end up with a Q plate.

After that, will be the slow process of recommissioning; replacing every consumable part, checking every safety-critical part, getting the engine working (it may or may not work, though it does turn over by hand), source the very few bits that didn't come with the car, and eventually getting it to a state in which I can MOT it. (I'm quite aware that at its age I don't have to MOT it, but with the amount of money this will cost me it would seem foolish to not spend an extra few dozen quid for an extra set of eyes to ensure that I have not done something stupid). My hilariously-over-optimistic timeline for this is to have this done before the end of Summer.

After that, let's talk about what I will not do. I want to do nothing that will change the car's character. It was designed to be a big, boaty cruiser for important people, and it will continue to be a big, boaty cruiser for some idiot from Norfolk. It is a silent straight 6, so it will stay a silent straight 6. (And if I was going to do a 3.5 litre V8 swap I've got one kicking around which is much more interesting to me than a Rover one.)

I also don't want to change the car's history. There are dents and scars on the body, and those are part of the car's past. I don't think I should attempt to do much with them. I probably will stabilise those scars where they are showing surface rust, so they don't turn into something worse. And even though the metallic paint is almost certainly not its original colour, that too is part of the car's history and not something I want to change. Plus, I love that colour.

What I will do are some tiny modernising touches. I'll definitely convert it to use an alternator & to have negative earth electrics, and replace any invisible electronic components with modern solid-state ones. It will definitely get seatbelts at some point, because I do not want the tiniest low-speed shunt to cause a brief, very exciting trip through the windscreen. I might do something about the distributor having points, and about the fact that viscous fans are wank...and probably a lot else, but you get the idea. Tiny modernising touches, as I said, that will make her a more viable daily.

That's all for now. Onwards!