Expereince
Ok, I just wanna share my experience, I just do a transplant on this month.
My car transplant 1.6 to local SGTi 1.8
I went to the bank, the bank require you to write a letter to them. The letter is to request to collect the vehicle grant. You wrote a reason that is for puspakom inspection and JPJ engine exchange. You don't have to tell them why you change the engine. If they ask, they only ask for fun. Tell them you park your car near a flooding area as a result entire engine need to replace or overall. Just tell them funny funny things to satisfy them lar. What u need to provide before you taking out the grant is you need to write a letter asking to get the grant, 2nd is the AP cert. of the engine u need to replace. They want it because of they want the engine no. If you purchase the engine locally like mine is SGTi, no AP, then you need to ask the seller to write you a letter that he sold the engine to you. Also don't forget to copy his vehicle grant too.
The bank will wrote a letter to JPJ, the letter written out, from the bank site they don't have any objection that you replace your vehicle with this engine XXXXXX (engine no). All the saman, responsibility after engine exchange will be bear by yourself only. The time you collect the letter you need the owner to take the document from the bank. Alternatively ask your owner (your mom) to write a letter and you can collect it. That's all.
Take all the documents and submit to JPJ. Ive waited for 6 months for JPJ to approve it. JPJ will issue u an approval letter and u take the letter to Puspakom for inspection.
I've gone thru a runner. I don't need to do anything and cost me RM650.
After puspakom inspection, finally need to submit back to JPJ, just allowing them to updating your vehicle data. Now when you submit this, they require you to go to the Commisioner of Oath (PesuruhJaya Sumpah). Got to The P.Sumpah and pay RM8. Fotocopy front and rear side of your IC (vehicle owner) and allow P.Sumpah to endorse it. Take the document back to JPJ and wait for 3 days.
That's all. Anything not clear just ask.. I've done this on 5/12/2005. Quite latest news.
From the begining I don't have to go to do anything except collecting back some of my documents in the bank. Puspakom and JPJ, I never go there. So to answer your question, I think your mom also no need to go anywhere. U can do it queitly and u just need your mom authorise you to collect a letter from the bank.
My car has changed to open pot air filter, removing the plug cover and change to twin pot brake caliper. I don't face a problem at puspakom.
So far paying RM650 I think it's worth. Everything included.